In this fifth volume of Boston Studies in the Philosophy of Science, we have gathered papers about the logic and methods of the natural sciences. Along with the individual pieces, there are several which have originated as commentaries but are now supplementary contributions: those by Stachel and Putnam. Grlinbaum's long essay developed from a paper first suggested for our Colloquium some years ago, and we are glad of the occasion to publish it here. Several of the papers were not first presented to our Colloquium but they are the work of friends and scholars who have contributed to our discussions along similar lines. We are grateful to them for allowing us to publish their papers: L Bernard Cohen, Hilary Putnam, Mihailo Markovic. And we are also grateful to C. F. von Weizsacker for his paper, recently presented to the Boston philosophical and scientific community as a lecture at M. LT. With these few exceptions, the fifth volume presents work which was partially supported by a grant from the U. S. National Science Foundation to Boston University. Such support will conclude with the fourth volume of philosophical studies of psychology, the social sciences, history, and the inter-relationships of the sciences with ethics and metaphysics. Unimportant circumstances made it necessary to publish that fourth volume after this fifth volume, and perhaps this will mildly suggest that neither science nor the philosophy of science needs to be constrained by orthodoxy of procedure.

The broad range of interdisciplinary concerns which are encompassed by the philosophy of science have this much in common: (I) they arise from reflection upon the fundamental concepts, the formal structures, and the methodology of the sciences; (2) they touch upon the characteristically philosophical questions of ontology and epistemology in a unique way, bringing to traditional conceptions the analytic apparatus of modern logic, and the new content and conceptual models of active scientific investigations. These sources are reflected in the present volume, which consists of the major portion of the papers presented to the Boston Colloquium for the Philosophy of Science in the academic year 1961-1962. There is no central theme nor any dominant approach in this colloquium. Initiated in 1960 as an inter-university interdisciplinary faculty group, the Colloqnium is intended to foster creative and regular exchange of research and opinion, to provide a forum for professional discussion in the philosophy of science, and to stimulate the development of academic programs in philosophy of science in the colleges and universities of metropolitan Boston. The base of the Colloquium is our philosophic and scientific community, as broad and heterodox as the academic, cultural and techno logical complex in and about this city. The Colloquium has been supported in its first full year, as an inter-institutional cooperative association, by a generous grant to Boston University from the U. S. National Science Foundation. We are most grateful for this help.

Stig Kanger (1924-1988) made important contributions to logic and formal philosophy. Kanger's dissertation Provability in Logic, 1957, contained significant results in proof theory as well as the first fully worked out model-theoretic interpretation of quantified modal logic. It is generally accepted nowadays that Kanger was one of the originators of possible worlds semantics for modal logic. Kanger's most original achievements were in the areas of general proof theory, the semantics of modal and deontic logic, and the logical analysis of the concept of rights. He also contributed to action theory, preference logic, and the theory of measurement. This is the first of two volumes dedicated to the work of Stig Kanger. The present volume is a complete collection of Kanger's philosophical papers. The second volume contains critical essays on Kanger's work, as well as biographical essays on Kanger written by colleagues and friends.

For some years we have been conducting at the University of Haifa an interdisciplinary seminar on explanation in philosophy and psychology. We habitually begin the seminar with some philosophical reflections on explanation - an analysis of the concept and its metaphysical underpinnings. We discuss the various models and proceed to examine explanation in the setting of psychology. Thus, from the outset, we have focused not only on the concept itself but also on its application. The objective that we have set for the seminar, attended by students from both departments, Philosophy and Psychology, has been a critical understanding of the concept of explanation, its use and limitations. We were keen on deepening our understanding of the concept and on exploring its applications in fields of knowledge other than psychology. This was the motivation for convening an international conference on explanation and its application. The conference took place in the spring of 1998 under the auspices of the University of Haifa. The present book is the fruit of this meeting. The reader should note that the second part of the Introduction presents a detailed analytical account of the book. We hope that this overview will facilitate efficient use of the book by directing the reader's attention to those issues that might be of interest to him or her.

This book tells the story of Wittgenstein interpretation during the past eighty years. It provides different interpretations, chronologies, developments, and controversies. It aims to discover the motives and motivations behind the philosophical community's project of interpreting Wittgenstein. It will prove valuable to philosophers, scholars, interpreters, students, and specialists, in both analytic and continental philosophy.

In this book, the author makes a systematic attempt to understand cognitive characteristics of translation by bringing its logical, pragmatic and hermeneutic features together and examining a number of scientific, logical, and philosophical applications. The book is for philosophers of science, linguists, logicians, historians of science, and scientists interested in philosophical questions of scientific change.

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.

Can a line be analysed mathematically such a way that it does not fall apart into a set of discrete points? Are there objects of pure mathematics that can change through time? L. E. J. Brouwer argued that the two questions are related and that the answer to both is "yes", introducing the concept of choice sequences. This book subjects Brouwer's choice sequences to a phenomenological critique in the style of Husserl.