John Dupre

Elliott Sober is among the leading contemporary contributors to the philosophy of biology. He also has an exceptional ability to explain difficult ideas clearly. He is therefore very well equipped to provide an accessible yet state-of-the-art introduction to the philosophy of biology, and in most respects this optimistic prognosis is justified by the present volume. Focussing on evolutionary biology, Sober provides a general overview of evolutionary theory; a chapter on creationism that serves as a vehicle for the discussion of the evidence for evolution; and chapters on fitness, the units of selection, adaptationism, systematics, and sociobiology. Sober displays a thorough mastery of both the biological issues and the recent philosophical controversies that have surrounded them, and the presentation is always lucid and free from unnecessary technicalities. Anyone not thoroughly conversant with contemporary discussions of evolutionary theory could learn from this book.

This book is the apologia of a frustrated reductionist. The frustration derives from Rosenberg's clear perception that the project of physicalist reduction, the reduction of all the sciences of complex objects to physics, is impossible, at least, as he often says, for beings hampered by our limited cognitive and computational abilities. The reductionism that survives this realisation is purely metaphysical. It is the firm commitment to the view that ultimately whatever happens happens because of the universally lawlike behavior of the physical particles of which everything is composed. What holds these theses together is supervenience. The physical correlate of a higher level property or kind is typically massively disjunctive. Thus although the intrinsic properties of a complex thing are fully determined by the properties of the physical particles of which they are composed, the physical property necessary and sufficient to determine such a higher level property is too complex and disjunctive for our feeble minds to grasp. The underlying physical heterogeneity of the properties or kinds we distinguish at higher structural levels is such as to make it vanishingly unlikely that these will enter into the kinds of universal laws characteristic of physics or chemistry.

In an earlier paper (Dupré 1984), I criticized a thesis sometimes defended by theorists of probabilistic causality, namely, that a probabilistic cause must raise the probability of its effect in every possible set of causally relevant background conditions (the "contextual unanimity thesis"). I also suggested that a more promising analysis of probabilistic causality might be sought in terms of statistical relevance in a fair sample. Ellery Eells (1987) has defended the contextual unanimity thesis against my objections, and also raised objections of his own to my positive claims. In this paper I defend and amplify both my objections to the contextual unanimity thesis and my constructive suggestion

The traditional home for the concept of a natural kind in biology is of course taxonomy, the sorting of organisms into a nested hierarchy of kinds. Many taxonomists and most philosophers of biology now deny that it is possible to sort organisms into natural kinds. Many do not think that biological taxonomy sorts them into kinds at all, but rather identifies them as parts of historical individuals. But at any rate if the species, genera and so on of biological taxonomy are kinds at all, there are various respects in which they fall short of the traditional requirements of naturalness. The members of biological taxa lack essential properties that make them members of a particular kind: any properties specific enough to belong only to members of the kind cannot be assumed to belong to all members of the kind. And if there are laws applying to members of biological taxa they are laws of very minor and local importance and, in view of the preceding point, at best probabilistic.

Metagenomics is an emerging microbial systems science that is based on the large-scale analysis of the DNA of microbial communities in their natural environments. Studies of metagenomes are revealing the vast scope of biodiversity in a wide range of environments, as well as new functional capacities of individual cells and communities, and the complex evolutionary relationships between them. Our examination of this science focuses on the ontological implications of these studies of metagenomes and metaorganisms, and what they mean for common sense and philosophical understandings of multicellularity, individuality and organism. We show how metagenomics requires us to think in different ways about what human beings are and what their relation to the microbial world is. Metagenomics could also transform the way in which evolutionary processes are understood, with the most basic relationship between cells from both similar and different organisms being far more cooperative and less antagonistic than is widely assumed. In addition to raising fundamental questions about biological ontology, metagenomics generates possibilities for powerful technologies addressed to issues of climate, health and conservation. We conclude with reflections about process-oriented versus entity-oriented analysis in light of current trends towards systems approaches.

It has increasingly been recognised that units of biological classification cannot be identified with the units of evolution. After briefly defending the necessity of this distinction I argue, contrary to the prevailing orthodoxy, that species should be treated as the fundamental units of classification and not, therefore, as units of evolution. This perspective fits well with the increasing tendency to reject the search for a monistic basis of classification and embrace a pluralistic and pragmatic account of the species category. It also provides a diagnosis of the paradoxical but popular idea that species are individuals: Species are not individuals, but the units of evolution are.

[John Dupré] This paper attacks some prominent contemporary attempts to provide reductive accounts of ever wider areas of human behaviour. In particular, I shall address the claims of sociobiology (or evolutionary psychology) to provide a universal account of human nature, and attempts to subsume ever wider domains of behaviour within the scope of economics. I shall also consider some recent suggestions as to how these approaches might be integrated. Having rejected the imperialistic ambitions of these approaches, I shall briefly advocate a more pluralistic approach to the understanding of human behaviour, and one which leaves some space for the possibility of genuine human autonomy. /// [John O'Neill] One response to Dupré's criticism of rational choice theory's unifying aspirations is that it is aimed at over-ambitious versions of the theory. Immodesty about the scope of rational choice theory may look more plausible given suitable modesty in assumptions about the rational agent. The paper examines problems with one immodest version of the theory-public choice theory-and show how these shed light on problems in modest versions employing minimal assumptions about the preference structure of rational agents. However, while rational choice theory may fail in its unifying ambitions, I argue those aspirations are defensible.

This paper considers the applicability of standard accounts of causation to living systems. In particular it examines critically the increasing tendency to equate causal explanation with the identification of a mechanism. A range of differences between living systems and paradigm mechanisms are identified and discussed. While in principle it might be possible to accommodate an account of mechanism to these features, the attempt to do so risks reducing the idea of a mechanism to vacuity. It is proposed that the solution to this problem requires the development of a philosophical account of process adequate to apply to living systems.

Suppose we discovered that all the women in the Slobbovian culture exhibit a strong preference for blue-handled knives and red-handled forks. They would rather starve than eat with utensils of the wrong color. We’d be rightly puzzled, and eager to find an explanation. ‘Well,” these women tell us, “blue-handled knives are snazzier, you know. And just look at them: these red-handled forks are, well, just plain beautiful!” This should not satisfy us. Why do they say this? Their answers may make sense to them, and even to us, once we’ve managed to insert ourselves to some degree into their culture, but that is not the end of it. We want to know why there is a culture with such apparently arbitrary and unmotivated preferences. To us outsiders, the need for an answer stands out, even if the Slobbovians themselves think their answers are self-evident and quite satisfying. Similarly, we may think it is just obvious that laughter is the appropriate response to humor. Why are some female shapes sexy and others not? Isn’t it obvious? Just look at them! But that is not the end of it. The universalities, regularities and trends in our responses to the world do indeed guarantee, trivially, that they are part of “human nature,” but that still leaves the question of why. Something must pay for these extravagant features. What? To answer, we need to adopt an evolutionary point of view, which encourages us to look at all aspects of human nature from the sort of alien, Martian perspective that science thrives on. This perspective, self-consciously objective and bristling with hooks for attachment to the rest of science, is anathema to John Dupré. It reeks of “reductionism” and “scientism” and “economism”. He wants to preserve and even privilege the traditional “explanations” of such features of human nature, not just as part of the story but as a part that excuses us from hunting for deeper, unifying explanations of the same features. Wittgenstein famously said that explanation has to stop somewhere, and Dupré seems to want it to stop just before these curiously invasive evolutionary questions get posed.