impossible triangle, after apprehension of the perceptively given mode of being of that 'object', the visual system assumes that all three sides touch on all three sides, whereas this happens on only one side. In fact, the sides touch only optically, because they are separate in depth. In Meinong's words, Penrose's triangle has been inserted in an 'objective', or in what we would today call a "cognitive schema." Re-examination of the Graz school's theory, as said, sheds light on several problems concerning the theory of perception, and, as Luccio points out in his contribution to this book, it helps to eliminate a number of over-simplistic commonplaces, such as the identification of the cognitivist notion of 'top down' with Wertheimer's 'von oben unten', and of 'bottom up' with his 'von unten nach oben'. In fact, neither Hochberg's and Gregory's 'concept-driven' perception nor Gibson's 'data-driven' perception coincide with the original conception of the Gestalt.

The Metaphysics of Science provides a clear, well-founded conception of modern science, according to which its core consists of particular metaphysical principles. On this view, both the empirical and the theoretical aspects of science are the result of the attempt to apply these metaphysical principles to reality. There is a flexibility in the application of the principles, however, so that, in their scientific guise, they may come to be reformed over time through scientific revolutions.This approach to modern science provides a unified conception of the enterprise, explaining such of its various aspects as the principle of induction, the nature of scientific knowledge and scientific reduction, the fundamental difference between the natural and social sciences, and the role of essentialism with respect to natural kinds. Furthermore, it provides a resolution of the long-standing debate between empiricism and realism.

What is the relationship between scientific research and ethics? Some think that science should be free from ethical and political considerations. Biomedical Research and Beyond argues that ethical guidance is essential for all forms of inquiry, including biomedical and scientific research. By addressing some of the most controversial questions of biomedical research, such as embryonic research, animal research, and genetic enhancement research, the author argues for a rich moral framework for the ethics of inquiry, based on the ideal of human flourishing. He then looks at other areas of inquiry, such as journalistic ethics, and military investigation, to see how similar they are to the ethics of scientific research. Finally, he looks at the virtues that must play a role in any life that is devoted to research and inquiry as a vocational commitment.

This book is intended as an exposition of a particular theory of time in the sense of an interrelated set of attempted solutions to philosophical problems about it. Generally speaking there are two views about time held by philosophers and some scientists interested in philosophical issues. The first called the A-theory (after McTaggart's expression A-determinations for the properties of being past, present or future) is often thought to be closer to our commonsense view of time or to the concept of time presupposed by ordinary language. It includes at least the following theses, (a) Logic ought really to include tensed quantifiers for existence on one of its important usages means, present existence. More generally, we can't reduce all tensed locutions to tenseless ones. (b) The distinction between past, present and future is an objective one. It is not, for example, dependent on our consciousness of change; some A-theorists hold also, that the distinction, in effect, is an absolute one.

As Europe moves toward 1992 and full economic unity, and as Eastern Europe tries to find its way in the new economic order, the United States hesitates. Will the new European economic order be good for the U.S. or not? Such a question is exacerbated by world-wide changes in the technological order, most evident in Japan's new techno-economic power. As might be expected, philosophers have been slow to come to grips with such issues, and lack of interest is compounded by different philosophical styles in different parts of the world. What this volume addresses is more a matter of conflicting styles than a substantive confrontation with the real-world issues. But there is some attempt to be concrete. The symposium on Ivan Illich - with contributions from philosophers and social critics at the Penns- vania State University, where Illich has taught for several years - may suggest the old cliche of Old World vs. New World. Illich's fulminations against technology are often dismissed by Americans as old-world-style prophecy, while Illich seems largely unknown in his native Europe. But Albert Borgmann, born in Germany though now settled in the U.S., shows that this old dichotomy is difficult to maintain in our technological world. Borgmann's focus is on urgent technological problems that have become almost painfully evident in both Europe and America.

Modern physical science is constituted by specialized scientific fields rooted in experimental laboratory work and in rational and mathematical representations. Contemporary scientific explanation is rigorously differentiated from religious interpretation, although, to be sure, scientists sometimes do the philosophical work of interpreting the metaphysics of space, time, and matter. However, it is rare that either theologians or philosophers convincingly claim that they are doing the scientific work of physical scientists and mathematicians. The rigidity of these divisions and differentiations is relatively new. Modern physical science was invented slowly and gradually through interactions of the aims and contents of mathematics, theology, and natural philosophy since the seventeenth century. In essays ranging in focus from seventeenth-century interpretations of heavenly comets to twentieth-century explanations of tracks in bubble chambers, ten historians of science demonstrate metaphysical and theological threads continuing to underpin the epistemology and practice of the physical sciences and mathematics, even while they became disciplinary specialties during the last three centuries. The volume is prefaced by tributes to Erwin N. Hiebert, whose teaching and scholarship have addressed and inspired attention to these issues.

What fundamental account of the world is implicit in physical theory? Physics straightforwardly postulates quarks and electrons, but what of the more intangible elements, such as laws of nature, universals, causation and the direction of time? Do they have a place in the physical structure of the world?
Tim Maudlin argues that the ontology derived from physics takes a form quite different from those most commonly defended by philosophers. Physics postulates irreducible fundamental laws, eschews universals, does not require a fundamental notion of causation, and makes room for the passage of time. In a series of linked essays The Metaphysics Within Physics outlines an approach to metaphysics opposed to the Humean reductionism that motivates much analytical metaphysics.

This is the second volume of Proceedings of the Israel Colloquium for the History, Philosophy and Sociology of Science. At the time that this preface is being written, the fourth annual series of lectures within the framework of the Israel Colloquium is already behind us and the fifth is underway. The Israel Colloquium thus has now not only a future to look forward to but also a past which is a source, of pride and pleasure for those who take part in this venture. The Israel Colloquium has, I believe, struck roots in the Israeli scientific and intellectual life, while drawing on the ever-increasing readiness of the international scientific and intellectual community for continuous support. As in the first volume, here too the papers presented, taken together, attempt a threefold representation of science and of the scientific activity: the historical, the social, and the systematic. A novel focal point in this volume is the treatment of some case studies illuminating historical, social, and philosophical aspects of medicine. Another center of gravity here is the Eddington Centennial Symposium which was a main event in the Collo quium activity of the 1982-83 series. This is a fitting place for me to report with sorrow the untimely death in the summer of 1984 of Solly G. Cohen, one of Israel's leading scientists, who is among the contributors to this volume."

Three events, which happened all within the same week some ten years ago, set me on the track which the book describes. The first was a reading of Emile Meyerson works in the course of a prolonged research on Einstein's relativity theory, which sent me back to Meyerson's Ident- ity and Reality, where I read and reread the striking chapter on "Ir- rationality". In my earlier researches into the origins of French Conven- tionalism I came to know similar views, all apparently deriving from Emile Boutroux's doctoral thesis of 1874 De fa contingence des lois de la nature and his notes of the 1892-3 course he taught at the Sorbonne De ['idee de fa loi naturelle dans la science et la philosophie contempo- raines. But never before was the full effect of the argument so suddenly clear as when I read Meyerson. On the same week I read, by sheer accident, Ernest Moody's two- parts paper in the JHIof 1951, "Galileo and Avempace". Put near Meyerson's thesis, what Moody argued was a striking confirmation: it was the sheer irrationality of the Platonic tradition, leading from A vem- pace to Galileo, which was the working conceptual force behind the notion of a non-appearing nature, active all the time but always sub- merged, as it is embodied in the concept of void and motion in it.

New essays in science history ranging across the entire field and related in most instance to the works of Charles Gillispie, one of the field's founders.

Why did the two most influential philosophers in the twentieth century, Ludwig Wittgenstein and Martin Heidegger, write in such a curious fashion that they confused a whole generation of disciples and created a cottage industry for a second generation in the interpretation of their works? Do those curious writing strategies have a philosophical signif icance? How does philosophical style reflect attitudes to society and politics or bear significance for the social sciences? Is politics one type of human activity among many other independent ones as the classical modem political theorists from Hobbes and Machiavelli onwards have thought, or is it part and parcel of all of the activities into which an animal that speaks enters? How could the latter be elucidated? If politics arises from legitimate disputes about meanings, what does this imply for current cultural debates? for the so-called social sciences? above all, for that cultural conversation which some consider to be the destiny of philosophy in the wake of the demise of foundationalism? These are a few of the most important questions which led me to the critical confrontation and reflections in the essays collected below."

During the academic years 1972-1973 and 1973-1974, an intensive sem inar on the foundations of quantum mechanics met at Stanford on a regular basis. The extensive exploration of ideas in the seminar led to the org ization of a double issue of Synthese concerned with the foundations of quantum mechanics, especially with the role of logic and probability in quantum meChanics. About half of the articles in the volume grew out of this seminar. The remaining articles have been so licited explicitly from individuals who are actively working in the foun dations of quantum mechanics. Seventeen of the twenty-one articles appeared in Volume 29 of Syn these. Four additional articles and a bibliography on -the history and philosophy of quantum mechanics have been added to the present volume. In particular, the articles by Bub, Demopoulos, and Lande, as well as the second article by Zanotti and myself, appear for the first time in the present volume. In preparing the articles for publication I am much indebted to Mrs. Lillian O'Toole, Mrs. Dianne Kanerva, and Mrs. Marguerite Shaw, for their extensive assistance."

The role Hans Hahn played in the Vienna Circle has not always been sufficiently appreciated. It was important in several ways. In the ftrst place, Hahn belonged to the trio of the original planners of the Circle. As students at the University of Vienna and throughout the fIrst decade of this century, he and his friends, Philipp Frank and Otto Neurath, met more or less regularly to discuss philosophical questions. When Hahn accepted his fIrSt professorial position, at the University of Czernowitz in the north east of the Austrian empire, and the paths of the three friends parted, they decided to continue such informal discussions at some future time - perhaps in a somewhat larger group and with the cooperation of a philosopher from the university. Various events delayed the execution of the project. Drafted into the Austrian army during the first world war" Hahn was wounded on the Italian front. Toward the end of the war he accepted an offer from the University of Bonn extended in recognition of his remarkable 1 mathematical achievements. He remained in Bonn until the spring of 1921 when he returm: d to Vienna and a chair of mathe matics at his alma mater. There, in 1922, the Mach-Boltzmann professorship for the philosophy of the inductive sciences became vacant by the death of Adolf Stohr; and Hahn saw a chance to realize his and his friends' old plan."

Nietzsche, Epistemology, and Philosophy of Science, is the second volume of a collection on Nietzsche and the Sciences, featuring essays addressing truth, epistemology, and the philosophy of science, with a substantial representation of analytically schooled Nietzsche scholars. This collection offers a dynamic articulation of the differing strengths of Anglo-American analytic and contemporary European approaches to philosophy, with translations from European specialists, notably Carl Friedrich von WeizsAcker, Paul Valadier, and Walther Ch. Zimmerli. This broad collection also features a preface by Alasdair MacIntyre. Contributions explore Nietzsche's contributions to the philosophy of language and epistemology, and include essays on the social history of truth and the historical and cultural analyses of Serres and Baudrillard, as well as new contributions to the philosophy of science, including theological and hermeneutical approaches, history of science, the philosophy of medicine, cognitive science, and technology.

Leibniz said with a mixture of admiration and inspiration that the Duchess Sophie of Hannover always wanted to know the reason why behind the reason why. And that is just how rationality works: it wants to leave no loose ends to understanding, seeking to enable us to understand things through to the bitter end. In the twelve chapters that make up Satisfying Reason, Rescher develops and defends the following perspective: That rationality is a cardinal virtue in cognitive matters. That this is not something simple and cut-and-dried: in the pursuit of truth through the development of knowledge we face obstacles -- sometimes even insuperable ones. All that we can do is the best we can, realizing that even our very best may still be imperfect. Nevertheless, the venture is far from hopeless. While absolutes are unattainable in the cognitive venture, some solutions are situationally optimal, being comparatively the best that can be managed under the circumstances. That reason itself enables us to come to terms with this state of affairs, urging us to accept the best we can do as good enough. Satisfying Reason is an explanation of the presuppositions and methods of rational enquiry, an original exercise in metaknowledge, developing a systematic body of knowledge about the scope and limits of knowledge itself.

Nietzsche, Theories of Knowledge, and Critical Theory, the first volume of a two-volume book collection on Nietzsche and the Sciences, ranges from reviews of Nietzsche and the wide variety of epistemic traditions - not only pre-Socratic, but Cartesian, Leibnizian, Kantian, and post-Kantian -through essays on Nietzsche's critique of knowledge via his critique of grammar and modern culture, and culminates in an extended section on the dynamic of Nietzsche's critical philosophy seen from the perspective of Habermas and critical theory. This volume features a first-time English translation of Habermas's afterword to his own German-language collection of Nietzsche's Epistemological Writings.

Polish philosophy of science has been the beneficiary of three powerful creative streams of scientific and philosophical thought. First and fore- most was the Lwow-Warsaw school of Polish analytical philosophy founded by Twardowski and continued in their several ways by Les- niewski, Lukasiewicz, and Tarski, the great mathematical and logical philosophers, by Kotarbinski, probably the most distinguished teacher, public figure, and culturally influential philosopher of the inter-war and post-war period, and by Ajdukiewicz, the linguistic philosopher who was intellectually sympathetic with the anti-irrationalist (as he would say), logistic and meta-theoretical inquiries of the Vienna Circle. Second was independent and lively Polish Marxism, with its fine development of social research under Krzywicki, a social anthropologist and younger contemporary of Engels, and then after the war the economist Lange, the philosophers Schaff, Kolakowski, Baczko, and many others. Finally there has been a wide range of philosophical, scientific and humanistic scholar- ship which lends its various qualities to the understanding of both the logic of science and the historical situation of the sciences: we mention only that great and humane physicist Infeld, the phenomenologist with deep epistemological interest Ingarden, the historian of scientific ideas Zawirski, the historian of philosophy and aesthetics Tatarkiewicz, and the mathematical logicians such as Mostowski and Szaniawski.

Azarya Polikarov was born in Sofia on October 9, 1921. Through the many stages of politics, economy, and culture in Bulgaria, he maintained his rational humanity and scientific curiosity. He has been a splendid teacher and an accomplished critical philosopher exploring the conceptual and historical vicis situdes of physics in modern times and also the science policies that favor or threaten human life in these decades. Equally and easily at home both within the Eastern and Central European countries and within the Western world. Polikarov is known as a collaborating genial colleague, a working scholar. not at all a visiting academic tourist. He understands the philosophy of science from within, in all its developments, from the classical beginnings through the great ages of Galilean, Newtonian. Maxwellian science. to the times of the stunning discoveries and imaginative theories of his beloved Einstein and Bohr of the twentieth century. Moreover, his understanding has come along with a deep knowledge of the scientific topics in themselves. Looking at our Appendix listing his principal publications, we see that Polikarov's public research career, after years of science teaching and popular science writing, began in the fifties in Bulgarian, Russian and German journals.

The main intention of this book is to bring together contributions from biology, cognitive science, and the humanities for a joint exploration of some of the main contemporary notions dealing with the understanding of origins in life, mind and society. The question of origin is inseparable from a web of hypotheses that both shape and explain us. Although origin invites examination, it always seems to elude our grasp. Notions have always been produced to interpret the genesis of life, mind, and the social order, and these notions have all remained unstable in the face of theoretical and empirical challenges. In any given period, the central ideas on origin have had a mutual resonance frequently overlooked by specialists engaged in theirown particular fields. As a consequence, this book should be of interest to a wide audi ence. In particular, for all those engaged in the social sciences and the philosophy of science, it is unique document, since bridges to the natural sciences in a mutually illuminating way are hard to find. Whether as a primary source or as inspirational reading, we feel this book has a place in every library. The material comes from an international meeting held in September 13-16, 1987 at Stanford University, organized by F. Varela and J.-P. Dupuy at the request of the Program of Interdisciplinary Research of Stanford University. We are grateful to Rene Girard, the Program Director, for making it possible with the help of the Mellon Foundation."

This volume is dedicated to Mario Bunge in honor of his sixtieth birthday. Mario Bunge is a philosopher of great repute, whose enormous output includes dozens of books in several languages, which will culminate with his Treatise on Basic Philosophy projected in seven volumes, four of which have already appeared Reidel, I 974ff. ]. He is known for his works on research methods, the foundations of physics, biology, the social sciences, the diverse applications of mathematical methods and of systems analysis, and more. Bunge stands for exact philosophy, classical liberal social philosophy, rationalism and enlightenment. He is brave, even relentless, in his attacks on subjectivism, mentalism, and spiritualism, as well as on positivism, mechanism, and dialectics. He believes in logic and clarity, in science and open-mindedness - not as the philosopher's equivalent to the poli tician's rhetoric of motherhood and apple pie, but as a matter of everyday practice, as qualities to cultivate daily in our pursuit of the life worth living. Bunge's philosophy often has the quality of Columbus's egg, and he is prone to come to swift and decisive conclusions on the basis of argu ments which seem to him valid; he will not be perturbed by the fact that most of the advanced thinkers in the field hold different views."

God and Gaia explores the overlap between traditional religious cosmologies and the scientific Gaia theory of James Lovelock. It argues that a Gaian approach to the ecological crisis involves rebalancing human and more-than-human influences on Earth by reviving the ecological agency of local and indigenous human communities, and of nonhuman beings. Present-day human ecological influences on Earth have been growing at pace since the Scientific and Industrial Revolutions, when modern humans adopted a machine cosmology in which humans are the sole intelligent agency. The resultant imbalance between human and Earthly agencies is degrading the species diversity of ecosystems, causing local climate changes, and threatens to destabilise the Earth as a System. Across eight chapters this ambitious text engages with traditional cosmologies from the Indian Vedas and classical Greece to Medieval Christianity, with case material from Southeast Asia, Southern Africa and Great Britain. It discusses concepts such as deep time and ancestral time, the ethics of genetic engineering of foods and viruses, and holistic ecological management. Northcott argues that an ontological turn that honours the differential agency of indigenous humans and other kind, and that draws on sacred traditions, will make it is possible to repair the destabilising impacts of contemporary human activities on the Earth System and its constituent ecosystems. This book will be of considerable interest to students and scholars of the environmental humanities, history, and cultural and religious studies.

During his lifetime, Henri PoincarA(c) published three major philosophical books which achieved great success: "La science et l'hypothA]se" (1902), "La valeur de la science" (1905) and "Science et mA(c)thode" (1908). After his death in 1913, a fourth volume of his philosophical works was published by his heirs as "DerniA]res pensA(c)es" (1913). The four books constitute the core of PoincarA(c)'s philosophic works and were given an ovation by scientific and general public. Around 1919, Gustave Le Bon wrote to PoincarA(c)'s widow. As the director of the "BibliothA]que de Philosophie Scientifique at Flammarion," he asked her permission to publish a second posthumous volume. "L'Opportunisme scientifique" was intended to be the fifth and final volume of PoincarA(c)'s philosophical writings. Louis Rougier had elaborated the project, with the collaboration of Gustave Le Bon, and the approval of the philosopher A0/00mile Boutroux and his son Pierre. Because of the reservations of the mathematician's heirs, this book was never published and DerniA]res pensA(c)es remained his last philosophical book. Nevertheless PoincarA(c)'s correspondence - which is kept in the PoincarA(c) Archives at University Nancy 2 - contains a large amount of documents concerning the project, its justification and the discussions between Louis Rougier and the mathematician's heirs. The aim of this book is to restore this episode, which gives some crucial informations about editorial practices of PoincarA(c) and about the posterity of his philosophic thinking.