Brit. J. Phil. Sci. 58 (2007), 409–422 Whence Philosophy of Biology? Jason M. Byron ABSTRACT A consensus exists among contemporary philosophers of biology about the history of their field. According to the received view, mainstream philosophy of science in the 1930s, 40s, and 50s focused on physics and general epistemology, neglecting analyses of the 'special sciences', including biology. The subdiscipline of philosophy of biology emerged (and could only have emerged) after the decline of logical positivism in the 1960s and 70s. In this article, I present bibliometric data from four major philosophy of science journals (Erkenntnis, Philosophy of Science, Synthese, and the British Journal for the Philosophy of Science), covering 1930–59, which challenge this view. 1 Introduction 2 Methods 3 Results 4 Conclusions 1 Introduction Philosophy of biology is young, at least as a subdiscipline of philosophy of science. Philosophical discussion of various aspects of the living world is of course ancient. Scholars have been doing 'philosophy of biology', in this sense, from at least the time of Aristotle. But only in the 1980s and 90s did philosophers of science establish philosophy of biology as an academic field. (General philosophy of science, in contrast, became a professional discipline by the late 1950s.) For example, the first (partial) philosophy of biology journal, History and Philosophy of the Life Sciences, commenced publication only in 1979. Four others would follow: Biology and Philosophy (first published in 1986), Ludus Vitalis: Revista de Filosofıa de las Ciencias de la Vida (in 1993), Jahrbuch für Geschichte und Theorie der Biologie (in 1994), and Studies in History and Philosophy of Biological and Biomedical Sciences (in 1998). The field's two professional associations are likewise recently founded: The International Society for History, Philosophy, and Social Studies of  The Author (2007). Published by Oxford University Press on behalf of British Society for the Philosophy of Science. All rights reserved. doi:10.1093/bjps/axm021 For Permissions, please email: journals.permissions@oxfordjournals.org Advance Access published on June 23, 2007 410 Jason M. Byron Biology (in 1989) and the Deutsche Gesellschaft für Geschichte und Theorie der Biologie (in 1991). The first generation of self-identified philosophers of biology emerged during the 1960s and early 1970s. Morton Beckner ([1959]) and Marjorie Grene ([1959]; Grene and Mendelsohn [1976]) were first, followed by David Hull ([1964], [1969], [1974]), Kenneth Schaffner ([1967a], [1967b]), Michael Ruse ([1973]), and William Wimsatt ([1972]).1 Beckner's Biological Way of Thought ([1959]) and Hull's Philosophy of Biological Science ([1974]) were especially influential. By the mid-1980s, a second generation of philosophers of biology ushered the field into a professional subdiscipline. That generation (from, roughly, the mid-1970s to the mid-1980s) included Ronald Amundson, John Beatty, Robert Brandon, Richard Burian, Lindley Darden, David Depew, John Dupré, James Griesemer, Philip Kitcher, Elisabeth Lloyd, Alexander Rosenberg, Elliott Sober, and Bruce Weber, among others. The recent origins of philosophy of biology might suggest that philosophy of biology had been previously neglected by philosophers of science. Why else, one might ask, would philosophers of science have carved out a new professional niche devoted to the analysis of biology? Indeed, the first philosophy of biology textbooks claimed that their subject had been ignored by contemporary philosophers of science in favour of physics. Consider the following, taken from a few introductions to philosophy of biology textbooks: One often finds philosophers remarking that the account of scientific methods and procedures drawn up by contemporary empiricists suffers from an undue preoccupation with the physical sciences (Beckner [1959], p. v). The author of a book on the philosophy of biology need offer no excuse for the subject he has chosen, since few areas of philosophy have been so neglected in the past 50 years (Ruse [1973], p. 9). The purpose of this volume will be to take a closer look at that area of science [biology] which has been passed over in the rapid extrapolation from physics to the social sciences (Hull [1974], p. 6). The philosophy of biology should move to the center of the philosophy of science-a place it has not been accorded since the time of Mach. Physics was the paradigm of science, and its shadow falls across contemporary philosophy of biology as well (Cohen and Wartofsky [1976], p. v). These statements were written by first-generation philosophers of biology. Together, they expressed the view that philosophy of biology had not fared well, at least vis-à-vis philosophy of physics, among philosophers of science at the time. The authors justified their projects as a remedy to that neglect. 1 For more exemplars of philosophy of biology at the time, see (Goudge [1961]); Rensch [1968]; Monod [1970]; Ayala and Dobzhansky [1974]). Whence Philosophy of Biology? 411 A similar view can be found in the textbooks published by second-generation philosophers of biology:2 In the last few decades, many philosophers have turned their attention to biology to assess the adequacy of a philosophy of science that has been drawn from an almost exclusive examination and reconstruction of physics (Rosenberg [1985], p. 13). Nor is it a surprise that, in this century particularly, the philosophy of science has become almost a subdiscipline in itself. But this does not include the philosophy of biology-at least, it did not until very recently. Although the father of philosophy of science, Aristotle, was as much a biologist as a philosopher, the philosophers of science in the twentieth century have focused mainly on the physical sciences, and any spare effort has tended to be directed toward the social sciences (Ruse [1988], pp. 1–2). Again, philosophers of biology claimed that philosophy of biology was not part of philosophy of science during its formative years as a discipline in the 1930s, 40s, and 50s. Indeed, the professionalization of philosophy of biology seems to have been fuelled, in part, by the conviction that philosophy of biology occupied a marginal position within early philosophy of science. But the rhetoric of return, to Mach or even Aristotle, suggests that philosophers of biology thought their marginalized situation was recent. Logical positivism, in particular, was often identified as the culprit. Betty Smocovitis, for example, suggests that contemporary philosophy of biology emerged 'out of the 1960s antireductionist movements in biology and antipositivist movements in philosophy'-while also acknowledging the need for further study (Smocovitis [1996], p. 105). Consider the following comments from Werner Callebaut, Elliott Sober, and Alexander Rosenberg: Sober: The positivists took as one of their main paradigms of a scientific theory Einstein's theory of relativity, and their philosophical problems and the views that they developed about them were often keyed to that single theory. To a lesser degree they considered quantum mechanics. But issues in biology did not interest them very much; specific issues that are internal to psychological theory matter to them almost not at all. Rosenberg: Well, if you look at the Encyclopedia of Unified Science, even back in the thirties and forties there were articles on economics and biology and other disciplines. 2 One finds less justificatory maneuvering in the introductions to philosophy of biology textbooks published after the late 1980s, perhaps because by then the field had attained a certain professional status and the authors felt no need to explicitly argue for the importance of biology in philosophy of science. See, for example, (Sober [1993]; Rosenberg [1994]; Mahner and Bunge [1997]; Hull and Ruse [1998]; Sterelny and Griffiths [1999]). Nevertheless, the received view of the history of philosophy of biology continues to be told-just not in textbooks (see, e.g., Callebaut [1993]; Wolters [1999]). 412 Jason M. Byron Callebaut: But in retrospect, we can say it was basically a philosophy of physics (of a rather peculiar kind). The 'application' of logicalempiricist views to, say, biology-I'm thinking of the work of someone like Woodger-now makes us smile-or cry. The thing may have been intended as general theory, but the methodology that was put forward. . . Rosenberg: . . .was drawn exclusively from physics. . . Callebaut: . . .and other fields had to fit that model. You agree with that. So a fundamental problem of older work in philosophy of biology was that to the extent it was done by people working in the positivist tradition, like Woodger, they had a very difficult time. Rosenberg: Yes, absolutely. Sober: What has happened since the demise of positivism is that philosophers have gotten interested in the details of particular scientific theories. In the 1930s, philosophers of physics were interested in relativity theory and quantum theory and that has continued to the present. Only more recently have philosophers of biology really gotten into the details of evolutionary theory and other theories in biology; and similarly with philosophy of psychology, I think. The demise of positivism allowed this proliferation to occur, because it was no longer necessarily a given that all scientific theories were the same; there could be problems internal to a scientific theory that might be of philosophical interest. (Callebaut [1993], pp. 73–4)3 Here, the emergence of philosophy of biology is explicitly tied to the putative fall of logical positivism after the 1950s-a view well entrenched among contemporary philosophers of biology. Why might this be? If we consider the history of philosophy of science literature, we find little to refute the received view of the origins of philosophy of biology and its relation to general philosophy of science. Standard historical treatments of logical positivism focus on the roles of physics and the social sciences in the development of philosophy of science (see, for example, Suppe [1977], pp. 3–241; Friedman [1999]). No mention is made of biology in those works, and that lacuna might suggest to some readers that the biological sciences did not contribute to the early development of philosophy of science in the 1930s, 40s, and 50s. Consider, too, general philosophy of science textbooks and key monographs published before the 1970s (i.e., during the 'first wave' of philosophy of biology). Almost all excluded biology in their explications of philosophical issues; a few discussed biology, but only very briefly (see, for example, Frank [1949]; Braithwaite [1953]; Toulmin [1953]; Goodman [1954]; Bergmann [1957]; Hanson [1958]; Madden [1960]; Nagel [1961]; Pap [1962]; 3 Comments were reconstructed by Callebaut to appear as an extended dialogue; however, these statements were expressed individually, and independently, in interviews conducted by him (see Callebaut [1993]). Whence Philosophy of Biology? 413 Popper [1959], [1962]; Hempel [1965], [1966]; Hesse [1966]; Salmon [1967]; Smart [1968]; Wartofsky [1968]). So the received view, even if inaccurate (as I shall argue), is not altogether implausible. Despite its apparently widespread acceptance, the received view of the origins of philosophy of biology as a subdiscipline of philosophy of science has never been systematically examined. The only historical treatment of philosophy of biology, Marjorie Grene and David Depew's The Philosophy of Biology: An Episodic History ([2004]), reconstructs the 'philosophies of biology' of various scholars, such as Aristotle, Descartes, and Kant, but it does not examine the emergence of philosophy of biology as an academic field.4 That work remains to be done. In what follows, I attempt a first-pass, rough-grain analysis of some relevant evidence. My ultimate aim is to determine the place of philosophy of biology within early philosophy of science, and I begin by examining founding journals of philosophy of science: Erkenntnis (first published in 1930), Philosophy of Science (in 1934), Synthese (in 1936), and the British Journal for the Philosophy of Science (in 1950). I am especially keen to evaluate the contributions of philosophy of biology to philosophy of science during the 1930s, 40s, and 50s-when philosophers of science established for themselves what questions, methods, concepts, and ideas would be central to their discipline, as distinct from scientific philosophy and analysis (Giere [1996]). Future work must flesh out the details and circumscribe the relevance of the evidence I present. But the time is ripe for a broad sketch of important trends. 2 Methods To assess the role and influence of philosophy of biology in the early development of philosophy of science I analyzed the contents of the first philosophy of science journals, published between 1930 and 1959: Erkenntnis (vol. 1 [1930–31] to vol. 8 [1939–40]), Philosophy of Science (henceforth, Phil Sci; vol. 1 [1934] to vol. 26 [1959]), Synthese (vol. 1 [1936] to vol. 11 [1959]), and the British Journal for the Philosophy of Science (henceforth, BJPS; vol. 1 [1950–51] to vol. 10 [1959–60]).5 Although other periodicals published work in philosophy of science during this period, none (with the exception of Minnesota Studies in the Philosophy of Science, which published just two volumes) published philosophy of science exclusively, and, consequently, none reliably tracks the career of philosophy of science as a discipline. I began by counting the total number of articles published in each journal during the 30-year period. I included only full articles ('Abhandlungen' 4 See also Hull ([forthcoming]). 5 Vol. 8 of Erkenntnis was published as the Journal of Unified Science (Erkenntnis). 414 Jason M. Byron in Erkenntnis) and full conference proceedings ('Berichte', 'Referate', or 'Vorträge'). Articles with multiple parts were counted separately, so long as they appeared separately in the table of contents or, when there was no table of contents, in separate issues or noncontiguously in the same issue. Next, I counted the total number of philosophy of biology articles published in each journal (among those counted as full articles). I excluded articles on behaviourism, phenomenology, philosophy of mind, psychoanalysis, and psychology. Much attention has already been paid to psychology and the social sciences in the history of philosophy of science literature.6 Here, I wanted to isolate articles on such topics as bioethics, botany, cytology, developmental biology, cognitive science, ethology, evolution, medicine, neurophysiology, and zoology. I carefully examined all articles that seemed to straddle philosophy of biology and philosophy of mind to better classify their contents. A few were true hybrids (for example, on the evolution of thinking or on the information-carrying capacities of particular neurons). I included them as philosophy of biology and marked them with an asterisk in the online supplemental material.7 3 Results A total of 1547 articles were published in Erkenntnis, Phil Sci, Synthese, and BJPS between 1930 and 1959. Of these, 137, or 8.9%, were devoted to philosophy of biology (see online supplement). Each year, an average of 9.6% of the total number published were on philosophy of biology (95% CI: 7.6–11.7%). The breakdown across journals is as follows: 178 articles were published in Erkenntnis (with 18, or 10.1%, on philosophy of biology), 739 in Phil Sci (with 66, or 8.9%, on philosophy of biology), 474 in Synthese (with 32, or 6.8%, on philosophy of biology), and 156 in BJPS (with 21, or 13.5%, on philosophy of biology). I computed a linear regression on the data set, which showed no significant change over time (see Figure 1). These results strongly refute the hypothesis, so integral to the received view, that philosophy of biology was excluded during the formative years of philosophy of science. Nevertheless, even if one acknowledges that philosophy of biology was not entirely neglected by early philosophers of science, there is a common belief that the kind of work they published was something other than 'real', or legitimate, philosophy of biology. That is, biology was either forced by early philosophers of science into a philosophical framework derived from 6 The influence of Gestalt psychology and Otto Neurath's political philosophy, to name but two examples, has been well studied. 7 Supplemental material is available at <www.pitt.edu/∼jmb165/Suppl.html>. Whence Philosophy of Biology? 415 Year Published P er ce nt ag e of B io lo gy A rt ic le s 0% 5% 10% 15% 20% 25% 1929 1934 1939 1944 1949 1954 1959 Figure 1. Philosophy of biology articles published per year (as a percentage of total published). physics or was run out of the realm of science altogether. Michael Ruse, for example, wrote the following in 1988: What little attention has been paid to biology [by twentieth-century philosophers of science] has been generally directed to one extreme or another. At one end of the spectrum we have those who were overly impressed by the turn-of-the-century formalisms of the logicians and mathematicians, and who wanted to do likewise for biology. Since they-especially their leader J. H. Woodger-were simultaneously empiricists of the most naively dogmatic kind, their efforts tended to go unread. At the other end of the spectrum we have those who feared and loathed materialism, and who were determined to prove that an understanding of organisms demands reference to vital forces or spirits- élans vitaux or entelechies-forever beyond the grasp of conventional science (Ruse [1988], pp. 1–2). Having, as we now do, a complete list of biology articles published in philosophy of science journals from 1930 to 1959, we are well positioned to assess Ruse's charge. Indeed, we do find several articles that deal with vitalismmechanism debates, and one or two authors advocated a 'vitalist' position.8 Moreover, we find several articles in the 'formalist' vein, which attempt to analyze biology along the lines of physics. However, this is not nearly the 8 Ruse's characterization of neo-vitalism as demanding explanatory recourse to forces 'forever beyond the grasp of conventional science' is misleading. However, for the purposes of this paper, it suffices to show that early philosophy of biology was not exclusively concerned with neo-vitalism, whatever that doctrine actually entailed. For a more nuanced analysis of the mechanism-vitalism debates published in Philosophy of Science, see Byron ([unpublished]). 416 Jason M. Byron whole story. Even a cursory glance through the list reveals a large number of articles that any contemporary philosopher of biology would recognize as 'real' philosophy of biology. Consider the following titles, listed in chronological order: • Das Biologische Individuum (1930–31) • Die Methodologischen Grundlagen der Biologie (1932–33) • Kausalität, Biologie und Psychologie (1934) • Indeterminism and Natural Selection (1934) • The Views of Haeckel in the Light of Genetics (1934) • Structure, Function and Growth (1935) • A Critique of the Species Concept in Biology (1935) • Prikkelverschijnselen bij Plant, Dier en Mensch, I–III (1936) • Some Principles of Causal Analysis in Genetics (1937) • De Tegenwoordige Stand van de Evolutie-Gedachte in de Ethnologie (1938) • Causaliteit en Causale Structuren: De Beteekenis van Deze Begrippen Voor de Wetenschap van Het Leven (1939) • What is a Gene? (1939) • History and Biological Evolution (1940) • Biological Causation (1940) • Diffusion and Biological Membrane Permeability, II (1941) • Geometry and Dynamics of Populations (1941) • Protoplasmic Activity (1941) • The Problem of Synthesis in Biology (1942) • A Biological Basis for Ethics (1942) • Vegetation as an Object of Study (1942) • The Theoretical Basis of Biotypology (1943) • The Role of Catalysis in Biological Causation (1943) • The Neurodynamics of Behavior: A Phylobiological Foreword (1943) • Organization (1944) • Levels of Research in the Biological Sciences (1945) • Chemistry and Evolution (1945) • A Theory on Causal Factors in the Origin of Life (1945) • Types and Similitudes: An Enquiry into the Logic of Comparative Anatomy (1946) Whence Philosophy of Biology? 417 • Objekt und Methode in der Biologie (1947–48) • Einheit und Methode in der Biologie (1947–48) • The Unity of the Morphological and Functional Aspects of Living Matter (1947) • The Effect of the Concept of Evolution on Scientific Methodology (1948) • The Concept of Evolution (1948–49) • Some Aspects of Theoretical Biology (1948) • The Logical Analysis of Kinship (1949) • An Analysis of Some Concepts and Terms in Vegetation Study or Phytocenology (1950–51) • Gradation of Language in Biological Systematics (1950–51) • Causation and Explanation in Theoretical Biology (1951) • Hans Selye and a Unitary Conception of Disease (1952) • Information in the Head (1953) • The Information Capacity of the Human Ear and of the Cochlear Nerve (1953) • What Do We Mean by 'Inborn'? (1953) • D'Arcy Thompson: His Conception of the Living Body (1953) • An Account of Recent Biological Methodology: Causal Law and Transplanar Analysis (1953) • The Evolution of Thinking (1954) • Theory of Integrative Levels (1954) • What is Disease? (1954) • The Place of Historical Statements in Biology (1957) • Ethics and Esthetics on a Biological Basis (1958) • Causal Explanations in Natural History (1958) • The Evolution of a Human Nature (1959) • Origin Explanations and the Origin of Life (1959) • On Deciding Whether Protistans are Cells (1959) Those titles, 55 in all, represent 40.2% of the total philosophy of biology articles published. And many of the titles I excluded from this list dealt, not with vitalism or formal analysis, but with cybernetics and other topics less often seen in contemporary philosophy of biology journals. Philosophy of science journals, therefore, were publishing 'real' philosophy of biology articles-many of them-throughout the 1930s, 40s, and 50s. 418 Jason M. Byron To summarize: nearly 10% of the articles published each year in the four professional philosophy of science journals from 1930 to 1959 were on philosophy of biology. Moreover, this rate of publication was steady with no significant change over the course of 30 years (at most, there was a slight tapering off of philosophy of biology articles during the 1950s, but this is not a statistically significant trend). While a minority of these articles concerned issues that we now consider dated, such as logical axiomatisation and vitalism, nearly half addressed subjects recognizable as topical today. But present relevance is neither here nor there with regard to the fundamental historical point; these data show that throughout the formative period of the professionalisation of philosophy of science, philosophy of biology was an active part of the field. 4 Conclusions Many have argued that logical positivism neglected the analysis of biology, focusing instead on the hierarchical termini of physics and, to a much lesser extent, the social sciences (Wolters [1999]). The emergence of a professional field of philosophy of biology was only made possible, according to this view, with the demise of logical positivism.9 However, the results of my preliminary analysis suggest something is very wrong with this story. Philosophy of biology articles appeared frequently and throughout the 1930s, 40s, and 50s in the four major philosophy of science journals: Erkenntnis, Philosophy of Science, Synthese, and the British Journal for the Philosophy of Science. Those articles, moreover, were not simply vitalist or formalist; 'real' philosophy of biology (as contemporary scholars might interpret it) was being published. In addition, biologists sat on the editorial boards of Phil Sci, Synthese, and BJPS throughout the period I examined. Clearly, philosophers of science were interested in biological issues and made them a central part of the discipline. Thus, while it is doubtless true that the '1960s antireductionist movements in biology and antipositivist movements in philosophy' shaped contemporary philosophy of biology, those movements do not explain its origins as a subdiscipline of philosophy of science. Philosophy of biology did not require antipositivism, in particular, to thrive. Logical positivists were long interested in 'real' philosophy of biology, and biologists and philosophers steadily published work in philosophy of biology throughout the 1930s, 40s, and 50s. If philosophy of biology was in bad shape by the late 1960s, as David Hull 9 Possibly, logical positivism never died (see Creath [1995]). For the purposes of my argument, it does not matter. Whatever the fate of logical positivism was, the rise of the profession of philosophy of biology ought not to be explained by a putative decline of logical positivism in the 1960s and 70s, as Sober and Rosenberg do (Callebaut [1993], pp. 73–4). Logical positivism did not suppress philosophy of biology in the first place. Whence Philosophy of Biology? 419 ([1969]) argued, its ills cannot be traced to any neglect by logical positivists in the decades immediately prior. Rather, the exclusion of philosophy of biology from philosophy of science seems to have occurred only after the professionalisation of philosophy of science in the late 1950s and 60s, when biologists (and other scientists) were displaced by professional 'philosophers of science' in the relevant journals (see Hardcastle and Richardson [2003]; Howard [2003]; Reisch [2005]). The rise of philosophy of biology as its own subdiscipline during the 1970s, 80s, and 90s may be better explained as a reaction to this displacement-and the abstraction away from science that generally occurred during the 1950s and 60s. The return to the science urged by and taken up with a vengeance by philosophers of biology (among many others) in the 1960s, 70s, and 80s gave the burgeoning field its problematic. It represented a broader return to-not a reaction against-the philosophy of science of the 1930s, 40s, and 50s, one in which philosophers and scientists together set the problematic of philosophy of science.10 Acknowledgements Ron Amundson, Jordi Cat, Richard Creath, Lindley Darden, Tom Gieryn, Jane Maienschein, George Reisch, Alan Richardson, Michael Ruse, Jutta Schickore, Brad Wray, and the audience at the 2006 meeting of the Society for the History of Philosophy of Science provided helpful comments on earlier drafts of this manuscript. Special thanks to David Hull, Betty Smocovitis, and Lisa Lloyd for their encouragement and advice. Any errors are mine. Department of History and Philosophy of Science University of Pittsburgh Pittsburgh, PA 15260 USA jmb165@pitt.edu References Ayala, F. J. and Dobzhansky, T. G. (eds). [1974]: Studies in the Philosophy of Biology: Reduction and Related Problems, London: Macmillan. Beckner, M. 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