The Taming of Evolution

Front matter

THE TAMING OF EVOLUTION

Davydd J. Greenwood

THE TAMING OF EVOLUTION

Contents

Preface rr

Introduction: The Darwinian Revolution? r9

I MAJOR WESTERN VIEWS OF NATURE 25

Preface

This book expresses my fascination with certain persistent Western ways of thinking about the relationship between biology and culture. Work that began as an excursion into contemporary nature/nurture controversies soon linked itself to my ethnographic and historical research in Spain and grew into an analysis of the nature/nurture debate as an element in Western culture.

Much is at stake in this controversy. The persistence of the nature/ nurture debate, apparently overcoming centuries of scientific attempts to break out of its constraints, tells us much about the ways key cultural notions persist where political and moral ideologies are involved. It also shows how complex the relationship between biological science and culture truly is. We are biocultural animals trying to understand how biology and culture interact and we are consistently derailed by the persistence of certain cultural construals of these relationships.

The project began in 1976, when Cornell University introduced a major called Biology and Society and I was asked to devise a core course on biocultural perspectives for upper-level students with strong

II

12 | Preface backgrounds in the biological sciences. These efforts showed me that there is a small set of recipes for biocultural arguments. The particular branch of biological science involved in the debate matters very little because political and moral issues form the real though often hidden centerpiece. I learned that if one enters this territory on the terms of the combatants, the resulting argument, whether biological determinist or cultural determinist, is both predictable and unrelated to the lessons of evolutionary biology.

Determinist and antideterminist positions also share many more features than would initially seem possible. Concepts of nature and human nature are used in strategically similar ways and the legitimating force of science is appealed to by both sides.

The conjunction of these points suggests a larger issue. In many respects, it appears that the pro- and antideterminist views are not two separate cultural systems in conflict; rather the debate itself is one single cultural system whose central feature is the nature/culture controversy. Scientifically, politically, and morally, these views depend on one another to such an extent that without the loyal opposition, each view dissolves into incoherence. Nature without culture or culture without nature cannot be conceived.

In this work I make extensive use of textual materials interspersed with commentary and analysis. Part I provides a general contrast between pre-evolutionary and evolutionary views of the world through a juxtaposition of humoral theories with the theories found in some of Darwin’s major works. Darwin’s writings serve as a point of contrast with the pre-evolutionary views and as a set of standards to be applied to contemporary views.

Though one would not think so, this kind of perspective on Darwin is not easy to come by. Darwin suffers from his own celebrity. For most audiences, his ideas are so famous that his works are rarely read. For others, Darwin’s worth is measured historically. He provided the first coherent formulation of the theory of evolution that was able to convince a large audience. But “first” also implies “now out of date.” Population and molecular biology, ethology, evolutionary ecology, and sociobiology have taken us so far beyond Darwin on so many points that those who view the development of science as a progressive process can see no reason to read his works. Darwin takes his place be-

Preface | 13 side the other great heroes of modern science in a pantheon that is worshiped rather than studied.

Darwin deserves to be reread now, not because he was right about the details of many aspects of the evolutionary process or because he was free of social and moral bias, but because his basic presentation of the structure and requirements of a genuinely evolutionary view of nature has never been bettered. Darwin moved the audiences of his time not simply by his patient accumulation of evidence but by his construction of a view of the world that was capable of overturning much of what was thought before. By comparison, many contemporary statements on evolution, though quite exact about DNA and RNA, are primitive as statements of the evolutionary view.

Part II brings together a diverse set of texts dealing with the question of race, constitutional types, and ethnic and national character. These materials show that pre-evolutionary conceptualizations of the relationship between nature and culture persist in some areas with no modification whatever. This form of persistence is referred to as “simple continuity.”

Part III examines two pre-evolutionary views of the natural basis of social order and two contemporary attempts at biocultural synthesis. The first texts center on the idea that social order reflects purity of blood. Others portray an egalitarian social order based on Christian equality before God. These texts are compared with the works of E. O. Wilson and Marvin Harris.

The juxtaposition of Wilson’s and Harris’ work with the pre-evolutionary texts and those of Darwin provides clear evidence that these contemporary thinkers construct nature and culture in ways that have more in common with the pre-evolutionary texts than with anything in evolutionary theory. Despite my belief in the sincerity of the intentions of both authors, I argue that the claimed evolutionism in their work is an illusion based on the adoption of a few evolutionary terms rather than on the acceptance of the full implications of an evolutionary view of the world. I call this form of persistence “complex continuity.”

To make this point, I could have included any-of hundreds of works, since these controversies have raged for centuries. I have chosen to examine Wilson’s human sociobiology and Harris’ cultural material-

14 | Preface ism because their views have generated such wide interest. Analysis of the works of Ashley Montagu, Robert Ardrey, Konrad Lorenz, Desmond Morris, Anthony Storr, Jacob Bronowski, Arthur Jensen, and many others might have served as well. It was tempting to include the most recent debate in this arena, that between Margaret Mead's supporters and Derek Freeman (Mead 1928, Freeman 1982), but there will always be yet another of these debates to deal with unless the very terms in which they are cast are challenged. 1 hope to provide such a challenge.

Textual analysis has intrinsic limitations. Texts must be selected from an immense inventory. Assumptions about context and authorial intention are unavoidable. Multiple readings are possible, even necessary. Texts are not determinate phenomena amenable to some transparent technology of interpretation. My analyses of these sets of texts are simply my analyses, to be accepted or rejected on the basis of other readings and juxtapositions with other texts.

Finally, the argument of this work is historical, but only in a limited sense. The comparison of the three major sets of texts is intentionally chronological in order to emphasize the persistence of nonevolutionary ideas in the works of contemporary scholars. A narrative history of these developments would take quite a different form and would be a contribution to the standard genre of the history of science. The obligations implied in the writing of narrative history would distract attention from the points to be made in the comparison of the texts. Should the analysis prove convincing, the narrative history would then have to be written with these points in mind.

Bringing this book to press has been difficult. Because it is sharply critical of both sides of the nature/nurture debate, it appeals to few active participants. I criticize both scholars whose political and moral stances I find objectionable and those whose stances I applaud. Despite the risks, we cannot permit the suspension of intellectual standards simply because the participants believe the issues to be so important that “winning is the only thing.” In fact, I believe they are so crucial that we can no longer afford the frivolity of repeating nature/ nurture homilies to ourselves.

Pilar Fernández-Cañadas de Greenwood has seen me through this effort with her enthusiasm for intellectual debate, collaboration in

Preface | 15 research, and detailed editorial suggestions. My son, Alex, understands and supports my passion for these issues.

Walter Lippincott, Jr., director of Cornell University Press, believes that some academic books should be published because they can promote intellectual debate. In an area where peer reviews often yield contradictory advice, he judged that mine is an argument that deserves a public hearing. An author cannot ask for more.

Successive generations of Cornell students in Biology and Society 301: The Biocultural Perspective have had these ideas arrayed before them. Both their enthusiasm and their questions have enabled me to clarify the issues.

Many colleagues have been involved with parts of this project. Among those who have offered stimulation and advice are James Boon, William Durham, Sander Gilman, David Holmberg, Edmund Leach, Eric Smith, Bruce Winterhalder, and Aram Yengoyan.

The teachings and friendship of Julio Caro Baroja, to whom this book is dedicated, have been an inspiration to me always.

DAVYDD J. GREENWOOD

Ithaca, New York

THE TAMING OF EVOLUTION

Introduction

The Darwinian Revolution?

From the very beginnings of Western thought, ideas about nature and culture and their interrelationships have been central themes in political and philosophical controversy. Moral and political changes have been wrought or reflected in shifting views of nature and culture.

Evolution, as a global theory about the processes that permeate “nature,” involves a drastic departure from previous theories and ultimately requires a substantial revision in views of nature and culture. Because the counterposed concepts of nature and culture entail moral and political considerations, evolutionary theory could have had immense social consequences. Social Darwinists and strict creationists were quick to point out this possibility in the nineteenth century, and the continuing struggle between evolutionists and creationists over the teaching of evolution in the public schools shows that the issue is not dead.

Nevertheless, and although evolutionism has indeed revolutionized views of nature, it has dealt successfully with nonhuman nature only. In the study of human beings, the trajectory of evolutionary theory has been obstructed not just by antievolutionists but by many schol-

20 | Introduction ars who believe they are applying evolutionary theory to the study of human beings. Evolutionary and antievolutionary views of human nature, though quite incompatible scientifically, can and do coexist.

It will immediately be countered that biological anthropology employs evolutionary principles in the study of humans. No one can doubt that it does. Human origins are generally treated evolutionarily; human genetics and population biology are thriving. Ecological principles are widely applied in the study of human groups, and human ethology is rapidly developing as a formal field of anthropological inquiry. Yet despite anthropology's avowed concern with a holistic biocultural view of humans, biological and cultural inquiry remain surprisingly isolated from each other. The human body, human populations, and human subsistence systems are treated in an evolutionary fashion, while culture is analyzed much as it would have been at any time in Western history before Darwin.! This widespread failure to synthesize the study of humans and their cultures cannot be attributed to lack of effort. Numerous attempts have been made, yet as different as their theoretical sources and ideological motivations have been, with very few exceptions they have fallen short in remarkably similar and predictable ways. Thus far, explanations of this general problem have fallen into two broad types: rationality explanations and political-economic explanations. Under the heading of rationality explanations are two subtypes: the “march of science” and unconscious bias.

The “march of science” is seen as an ongoing struggle between the obvious empirical conclusions of science and traditional beliefs. The extent to which evolutionism remains unincorporated in the synthetic study of humans is attributed to a kind of simple survival of prescientific ideas.? This view has many weaknesses. It segregates scientific research from other cultural activities in a way that is neither operationally feasible nor anthropologically defensible. It forces us to take a limited view of science as supracultural and to treat the rest of culture outside science as essentially irrational. It also fails to explain what is at stake for the opponents in the conflicts between different views, reducing the issue solely to a battle between superstition and rationality, to warfare between theology and science.

The second kind of rationality view has been nicely synthesized by

The Darwinian Revolution? | 21

Stephen Jay Gould in his fine book The Mismeasure of Man (1981). Gould argues that the recurrence of racist uses of IQ tests and other measurement techniques is aided by “unconscious bias.” This concept liberates us from the suspicion that all racists are cynical plotters against the truth and it implies the existence of a coherent structure of expectations about the phenomena of the world which guides the thoughts of scientists and nonscientists alike. But unconscious bias is too limited an idea for such a broad explanatory task. To the extent that unconscious biases are shared widely and perpetuated despite use of empirical data and sound analytical procedures, they are not biases at all. They are collective conceptions about the structure and operation of the natural world and its significance for us. They are cultural systems.

The “unconscious bias” explanation individualizes the problem culturally and socially. The persistence of nonscientific views is treated as a matter of individual perceptions, and thus deflects us from an analysis of the evident similarities between the unconscious biases of many scholars and their appeal to a broad public. It also fails to take account of the social interests that are served by particular formulations of the relationship between nature and culture.

Political-economic explanations have been elaborately developed in recent years under the general name “social studies of science.” Though still a young field, it offers exciting perspectives on the emergence, acceptance, and rejection of scientific developments.’ A portion of this scholarship reveals the internal social structures of the biological and medical sciences, traces the social-class interests served by certain of their technologies and ideas, and correlates patterns of theoretical development with political and economic situations. On balance these works suggest—they do not yet demonstrate fully—that the most powerful ideas are generally those that favor the interests of the socially powerful.*

Though this is promising work, at its core lies a serious unresolved problem that is recognized by most practitioners. A theoretical perspective that deals with the actual relationship between ideological systems and political-economic structures remains to be developed. When the complexity of individual cases is examined, relatively simple deterministic models prove inadequate. Eventually a theoretical for-

22 | Introduction mulation of the relationship between ideology and society capable of taking both ideological and political-economic causes into account will be needed. At present the multiplicity of verbs that are used to refer to this relationship reveals the confusion. Ideological systems are variously said to “reflect,” “embody,” “correlate with,” “describe,” “explain,” “legitimate,” or even “embrace” political-economic structures.

Our ability to deal with all of these problems can be substantially improved if we take a more anthropological view of the way cultural systems operate. The coherence, inclusiveness, and staying power of cultural systems, the interpretive functions they perform, and the moral charge they carry must be brought specifically to bear on the analysis of the use to which evolutionary theory has been put in the study of humans.

This is not a new arena for anthropology, and anthropology is by no means the only actor in it. Since its inception the discipline has taken a central role in polemics about biological determinism, having taken strong public positions against racism, eugenics, and environmental determinism. Anthropologists have argued that what is “natural” to humans is by no means easily determined. Some argue that questions about what is natural to humans are wrongheaded, since all humans become human only through culture.’ Others claim that with sufficient cross-cultural data and proper analytical care, we may identify human universals that have biological bases.* Whichever view one takes, it is clear that the relationship between biological and cultural systems has long been a central concern of anthropology.

Received wisdom suggests that the major difficulty standing in the way of a biocultural evolutionary synthesis is either the incomplete assimilation of evolutionary perspectives in the study of humans or the sheer political/moral manipulation of evidence and theory. Yet most of the current perspectives, both pro- and antideterminist, can be found clearly stated in texts written both long before and long after Darwin’s time. There seems to be a characteristically Western way of assimilating information about nature into political/moral views about culture, a way as yet little modified by the development of evolutionary theory.

The Darwinian Revolution? | 23

Many pre- and nonevolutionary views treat species as fixed natural categories that embody the ideal form of each species.” This ideal form generally arises in an act of creation that also orders all species into a harmonious system. Creation and subsequent history either are providentially guided or follow some teleological principle.

An evolutionary view, in contrast, treats species as momentary organizations of the immense amount of variation that all organisms produce. These species are formed by natural selection. The dialogue between variation and selection has no inherent direction. The composition of life on earth at any period differs from that in any other period.

It should be clear that pre-evolutionary and evolutionary conceptions of nature are incompatible. Momentary organizations of variation in species cannot be reconciled with ideal and timeless species forms. One must be an evolutionist or not. As obvious as this proposition seems, some scholars think these views to be reconcilable, or at least they throw logic to the winds and reconcile them willy-nilly.

Pre- and nonevolutionary views persist at present in two different ways. In some contexts, pre-evolutionary ideas and language simply continue unmodified. Such thinking is much more prevalent than it may appear. More important, there is a complex form of continuity in which pre-evolutionary terminology has been mostly abandoned but the pre-evolutionary conceptual structure persists essentially intact.

It appears that to most people, pre- and nonevolutionary views are much more attractive than evolutionary views. This attraction requires explanation, especially in light of the great success of evolutionism in the biological and medical sciences. I believe the main reason is that pre- and nonevolutionary views offer a clear relationship between nature and the determination of political/moral conduct. Evolutionism, properly understood, not only explicitly rejects such a relationship but undercuts the vision of nature on which it stands. Evolutionary theory must argue that the difference between “is” and “ought” cannot be bridged by science, a point eloquently made by François Jacob in The Possible and the Actual (1982).

Our society characteristically distrusts political and moral systems

24 | Introduction that do not rest on assertions about nature and human nature. In order to preserve this practice (and its dubious social benefits) we are willing to entertain an amazing amount of contradiction between the evolutionism we claim to subscribe to and the ideological uses we attempt to make of it.

I Major Western Views of Nature

To demonstrate that pre-evolutionary views of human nature persist and still dominate thinking about human beings, a necessary first step is to differentiate clearly between pre-evolutionary and evolutionary views of the biological world. In arguments about these issues a clear understanding of the differences between these views is usually assumed to exist; yet the crux of the differences is not clear to a great many of us.

Thus Part I sets out the pre-evolutionary and evolutionary views and tries to sharpen our sense of the minimum requirements that must be met if a view is to be called evolutionary. The crux of the difference between pre-evolutionary and evolutionary views centers on their conception of the categories of things in the biological realm. Pre-evolutionary thinkers asserted the existence of fixed natural categories. Evolutionism construes the biological world as a dynamic system composed of ever-changing species.

No amount of accommodative goodwill can reconcile these two views comfortably. And from these differences arise greater differences in the understanding of the broad historical processes that have resulted in life as we know it and that will continue to operate whether we wish them to or not.

CHAPTER I Humoral/Environmental Theories and the Chain of Being

Current arenas in the ongoing conflict over the relationship between nature and culture are easy to locate. The terms of debate are familiar because there is a general consensus about the relevant theories and evidence to be discussed. The semantic and lexical impact of evolutionism is strong and provides the needed signposts. But before evolutionism, comparable discussions of the human condition employed different terminologies and styles of argument.

The pre-evolutionary literature dealing with “human nature” and its social, political, ethical, and theological consequences spans the whole Western tradition. Nevertheless, it is difficult to find contemporary analytical discussions that focus directly on these biological issues because of the tendency to dematerialize the material/biological dimensions of important philosophical works and to forget how concerned major thinkers have been with exceedingly mundane problems. The history of biological and medical thought, for example, is often treated separately from the history of Western philosophy.!

Naturalistic Views of Society

My choice of materials is guided by some specific assumptions about the necessary contents of any naturalistic view of society, evolutionary or not. Any such view provides answers to the following questions:

1. What exists in the world and how is it organized?

2. How much of the outside world is found inside of human beings?

3. Are humans an entirely special form of creation, or are we constituted of the same matter as all the other things in the cosmos, differing from other life forms only in organization? If it is assumed that humans are composed of the same matter as everything else in the world, a fourth question then arises:

4. How does what is outside in the world get inside of human beings? This question centers on the mixed sources of heredity and environment as they influence human structure and behavior.

5. Is matter from the outside world altered in any way when it is found inside of human beings? This question involves a complex of ideas about the transformation of the primary constituting properties of matter into blood, bone, and tissue as manifested in a human body.

The final question is complexly theological and theoretical:

6. What is left of a human being if all matter from the outside world is removed? Centering on the host of issues about the mind and the soul, this question includes others about the organizational principles that give humans particular characteristics and whether or not these organizational principles are intrinsic aspects of physical matter.

A naturalistic view of society thus provides an explanation of the origin, structure, and behavior of living things and then places humans within that context. It does so against the backdrop of a theory of the structure and operation of the material universe. Darwin’s theory of the origin of species and the descent of humans is one such theory.

Before Darwin, a combination of ideas about the material structure of the universe, its relation to the structure and behavior of human beings, and the origin of the entire system dominated Western thought from the fifth century B.c. onward. This tradition includes theories about the physical elements of the universe, their effect on the humoral constitution of human beings, and the origins of the separate categories of living things (i.e., the “origin of species”).

A caveat is needed. Over two millennia of Western thought are compressed into a simple mold here. This necessary simplification makes it difficult to see that the attractiveness of these ideas lay precisely in their ability to organize the complex world of experience into intelligible categories for thought and action. A much more elaborate discussion of these issues is available in Ernst Mayr’s Growth of Biological Thought (1982).

Humoral/environmental theories form an intriguing and complex explanatory system linking the universe, the earth, humans (as a group and as individuals), and even historical events into a single overall scheme. Simultaneously they provide practical guidelines for conduct. These systems are based on meticulous, consistent observations of the physical, biological, and cultural worlds. They assert that the world is orderly and that it can be studied by systematic means.

The fundamental materialism of this tradition makes a clear appearance in the great medical texts of antiquity. Soon thereafter the separation between material and moral causes of temperament and disease ramifies into a fully developed empirical tradition (Lain Entalgo 1961).

The humoral/environmental theories are always emphatically nonevolutionary. They offer no dynamic, material explanation of the origins of the categories of living things or any continuing process by which new categories come into being. Early on, the species are the work of a variety of gods or processes of interbreeding; later they are produced by the God of Genesis.

The power of these humoral/environmental theories is amply demonstrated by their durability. When in the eighteenth century the Spanish medical thinker Martin Martinez made a thorough critique and attempted renewal of medicine, he expressed his ideas in two volumes of dialogues between a chemist, a follower of Hippocrates, and a follower of Galen. Knowledge of Hippocratic and Galenic texts makes most of Martinez’ arguments—and those of his English, French, German, and Italian colleagues—quite intelligible despite the many centuries and scientific discoveries that separate them. Qualities, elements, and humors were as fundamental to eighteenth-century thought as they were in antiquity; these ideas persisted through the Arabic renderings of Galen and other classical writers until the originals were rediscovered during the Renaissance.

The basic structure of ideas consists of sets of dual oppositions. Figure 1 charts their interrelationships. According to their structure of ideas, the material world is divided into primary qualities, elements, and humors. The primary qualities are not themselves manifested directly in matter; rather they are the fundamental characteristics that cause the various compositions of matter in the perceivable world. These qualities are arrayed as two sets of dual oppositions: hot/cold and dry/moist. Everything in the world is a material manifestation of combinations of these primary qualities. The basic elements of perceivable matter—earth, air, fire, and water—result from the differing combinations of the primary qualities. Dry and cold yields earth; moist and cold, water; moist and hot, air; and hot and dry, fire. All things in the material universe are made up of varying combinations of these four elements, which in turn are combinations of the primary qualities.

When these four elements combine to form organic beings, they are converted from elements into humors. These substances that constitute organic beings retain the properties of the elements that give rise to them. In a living body, fire yields yellow bile; air becomes blood; earth becomes black bile; and water yields phlegm. All beings are made up of particular combinations of these four humors. Every species and individual has its particular humoral makeup.

Each of the humors has a direct behavioral counterpart in this complex cultural system. Personal characteristics are explained by reference to the predominance of certain humors and the actions of these humors are explained by their elemental makeup. Direct material causation of physical and behavioral states is thus assumed. The predominance of yellow bile (fire, hot and dry) leads to choleric behav-

Hot

Element: Fire Element: Air Humor: Yellow bile Humor: Blood Characteristic Characteristic

temperament: Choleric temperament: Brave, noble

Moist

Element: Earth Element: Water Humor: Black bile Humor: Phlegm Characteristic Characteristic temperament: Melancholic temperament: Phlegmatic Cold

FIGURE 1 Elements, humors, and characteristic temperaments associated with combinations of the four qualities ior. The prevalence of blood (air, hot and moist) yields militancy and courage. When phlegm controls (water, moist and cold), passivity prevails; and the dominance of black bile (earth, cold and dry) causes melancholy. Many forces influence the balance of the humors, genealogy and the environment being the primary ones.

In antiquity the study of the humors and their causes and effects (termed physiologia physis) embraced the double meaning of “Nature” and the multiple “nature” of things. Nature and the multiple natures were assumed to have a logos, a harmonic reasonableness in them. Human logos was rational knowledge, among other things. Thus human logos attempted to understand and control the logos of Nature and of natures. This activity was called physiologia—human logos seeking to understand and manage the logos of the physis. And this activity was based on an understanding of the elements and the humors.

To most Westerners, these concepts are vaguely familiar. Even though the language of biles and humors has become obsolete or at least archaic, the complex metaphorical relationships between hot and dry: fire and anger; hot and moist: blood and life; cold and moist: water and peace; and cold and dry: earth and melancholy remain intelligible. Indeed, they are found in ordinary speech to a surprising extent. Powerful literary associations and present-day assumptions about racial characters are based on them.

A basic characteristic of the humoral/environmental theory is its complex hierarchical quality. The universe is constructed of combined primary qualities, physically manifested as elements. All parts of the universe must have these constituents; they must be, in a sense, microcosms of the macrocosm. Differences between distinguishable physical things arise from the quantitative differences in the combinations of the elements of which they are formed. In the organic world the elements are manifested as humors, and the humors, depending on their quality and quantitative mixtures, determine behavior.

From top to bottom and from outside to inside, the universe is made up of varying combinations of four primary qualities. The differences between things reflect only the differing quantitative mixtures of these qualities in the form of elements and humors.

The Environmental and Genealogical Principles

Explanation in this system is basically a matter of accounting for the composition of a particular thing, be it a planet, a rock, a human, a disease, or an emotion. The accounting can be done in two related ways. First, the physical conditions that prevailed at the place and time an entity originated can be used to explain its character—that is, direct environmental causation. For convenience I will call it the “environmental principle” of causation.