History of science, it has been argued, has benefited philosophers of science primarily by forcing them into greater contact with “real science.” In this paper I argue that additional major benefits arise from the importance of specifically historical considerations within philosophy of science. Loci for specifically historical investigations include: (1) making and evaluating rational reconstructions of particular theories and explanations, (2) estimating the degree of support earned by particular theories and theoretical claims, and (3) evaluating proposed philosophical norms for the evaluation of the degree of support for theories and the worth of explanations. More generally, I argue that theories develop and change structure with time, that (like biological species) they are historical entities. Accordingly, both the identification and the evaluation of theories are essentially historical in character.

An examination of difficulties in three standard accounts of functions leads to the suggestion that sentences of the form “the function of x is to do y” are used to make a variety of different claims, all of which involve a means-end relationship and the idea of design, or use, or benefit. The analysis proposed enables us to see what is right and also wrong with accounts that analyze the meaning of function statements in terms of good consequences, goals, and etiological explanation. It also enables us to show that function sentences can be used in providing various types of explanations, including, in certain cases, noncausal explanations of the presence of the item with the function.

Carl G. Hempel has often stated that inductive-statistical explanations, as he conceives them, are inductive arguments. This discussion note raises the question of whether such arguments are to be understood as (1) arguments of the traditional sort, containing premises and conclusions, governed by some sort of inductive “acceptance rules,” or (2) something more closely akin to Carnap's degree of confirmation statements which occur in an inductive logic which entirely eschews inductive “acceptance rules.” Hempel's writings do not seem unequivocal on this issue. It is suggested that adoption of construal (2) would remove the need for Hempel's high probability requirement on I-S explanations.

This paper analyzes the generation and function of hitherto ignored or misrepresented interfield theories, theories which bridge two fields of science. Interfield theories are likely to be generated when two fields share an interest in explaining different aspects of the same phenomenon and when background knowledge already exists relating the two fields. The interfield theory functions to provide a solution to a characteristic type of theoretical problem: how are the relations between fields to be explained? In solving this problem, the interfield theory may provide answers to questions which arise in one field but cannot be answered within it alone, may focus attention on domain items not previously considered important, and may predict new domain items for one or both fields. Implications of this analysis for the problems of reduction and the unity and progress of science are mentioned.

The few extant arguments concerning the autonomy of science in the rational acceptance of hypotheses are examined. It is concluded that science is not morally autonomous, and that the attendant notion of rationality in science decisionmaking is inadequate. A more comprehensive notion of scientific rationality, which encompasses the old one, is proposed as a replacement. The general idea is that scientists qua scientist ought, in their acceptance decisions, to take into account the ethical consequences of acceptance as well as the consequences with regard to the attainment of “purely scientific” or “epistemic” objectives. The result constitutes an argument for a (presumably cooperative) game theoretic treatment of inductive logic.

William K. Goosens claims to show that my account of epistemic utility runs into serious difficulties when confronted with certain attractive conditions of adequacy for the evaluation of experiments. I show that those conditions of adequacy which are, indeed, acceptable to both of us are satisfied by the procedures for evaluating experiments mandated by combining my theory of epistemic utilities with the approach to evaluating experiments on which Goosens' argument is based. In particular, I demonstrate that my theory does not violate the requirement that an “ideal experiment” be no worse than any alternative experiment.

Several revisions of the Hempel and Oppenheim definition of explanation have been offered in recent years, and none have gone uncriticized in the literature. In the present paper it is argued that the difficulties involved with these attempts are based upon a confusion between three types of explanation, and that Professor David Kaplan's model of S-explanation provides a uniform treatment of all three types.

Hempel's high probability requirement asserts that any rationally acceptable answer to the question ‘Why did event X occur?‘ must offer information which shows that X was to be expected at least with reasonable probability. Salmon rejected this requirement in his S-R model. This led to a series of paradoxical consequences, such as the assertion that an explanation of an event can both lower its probability and make it arbitrarily low, and the assertion that the explanation of an outcome would have qualified as an explanation of its non-occurrence as well.

We argue that if inductive explanations are to be seen as generalizations of the causal-deterministic model, or if they are to be seen as satisfying the requirement—fulfilled by the D-N model—that explanations ought to identify certain features of the universe that are nomically responsible for the explanadum event, then the high probability requirement seems to be unacceptable. If this is so, a realistically inspired theory of inductive explanation will be committed to the paradoxes that follow from Salmon's model.

This paper argues that the medical conception of health as absence of disease is a value-free theoretical notion. Its main elements are biological function and statistical normality, in contrast to various other ideas prominent in the literature on health. Apart from universal environmental injuries, diseases are internal states that depress a functional ability below species-typical levels. Health as freedom from disease is then statistical normality of function, i.e., the ability to perform all typical physiological functions with at least typical efficiency. This conception of health is as value-free as statements of biological function. The view that health is essentially value-laden, held by most writers on the topic, seems to have one of two sources: an assumption that health judgments must be practical judgments about the treatment of patients, or a commitment to “positive” health beyond the absence of disease. I suggest that the assumption is mistaken, the commitment possibly misdescribed.

Rudolf Carnap defended two quite different critiques of traditional philosophy: in addition to the much discussed verifiability criterion, he also proposed a critique based upon “formalizability.” Formalizability rests upon the principle of tolerance plus an acceptance of a linguistic methodology. Standard interpreters of Carnap (e.g., [7] and [8]) assume that the principle of tolerance (and, hence, formalizability) gains its argumentative support from verificationism. Carnap, in fact, kept the two critiques separate and independent. Indeed, verificationism is even, in spirit, inconsistent with tolerance. If the formalizability approach is emphasized, traditional metaphysics is reconstructed, not banished. Philosophical disputes remain rationally decidable, but metatheoretical in nature. Two results follow: Carnap's metaphilosophy cannot be rejected merely on the basis of rejections of verifiability. Second, Carnap's conclusion that all philosophy concerns language provides no reason for despair.

The current sociotechnical enterprise known as technology assessment (TA) is examined. Applying Skolimowski's analysis of epistemic possibility, the two foci of TA activities, impact analysis and policy analysis are shown to involve different logical and methodological forms. Impact analysis is shown to follow the logic of applied science while policy analysis involves the logic of technological design. Methodological implications of this distinction are isolated. Areas requiring conceptual clarification internal to TA practice are identified and limitations of the overall approach are articulated.

Carl G. Hempel's doctrine of essential epistemic relativization of inductive-statistical explanation seems to entail the unintelligibility of the notion of objective homogeneity of reference classes. This discussion note explores the question of whether, as a consequence, essential epistemic relativization also entails the unintelligibility of the doctrine of indeterminism.

Since the appearance of T. S. Kuhn's The Structure of Scientific Revolutions, scholars from various fields have sought to evaluate their disciplines in the light of Kuhnian criteria for scientific change. In this paper I argue that a new paradigm seems needed in high energy physics, and that there is no more reason to say that matter is made of elementary particles, than to say that it is not.

My argument, that high energy physics is approaching a state of crisis, and that a new paradigm is needed, is based on an examination of two events which, according to Kuhn, presage a conceptual revolution: (1) the “old” paradigm of normal science becomes unclear; and (2) this paradigm fails to support normal problem solving research, and scientists begin to use it as if it were merely definitional. After examining the elementary particles paradigm in the light of these two criteria, I conclude that high energy physics is moving from “normal science” to “extraordinary science.” I argue neither that a new paradigm has been found, nor that a return to normal science is imminent; instead I attempt to briefly outline some of the conceptual problems in high energy physics to which Heisenberg, Feynman, and others have alluded, but which so far have not been spelled out in any great philosophical detail. No attempt is made to argue about what the specific consequences of these difficulties might be, but merely to begin to clarify the problems facing scientists dealing with elementary particles.

Simon Kochen and Ernst Specker's well-known argument ([6]) against hidden variable theories for quantum mechanics is also an argument against the possibility of quantum systems having, simultaneously, precise values for all of the dynamical quantities associated with such systems. Devices for defeating the argument were in the literature even before its publication, but recently Arthur Fine has raised a new difficulty ([4]). Fine points out that Kochen and Specker's argument requires the following principles:

A model of causation is presented which shares the advantages of Reichenbach's definition in terms of the screening-off relation, but which has the added advantage of distinguishing cause and effect without reference to temporal directionality. This model is defined in terms of the masking relation, which in turn is defined in terms of the equivocation relation of communication theory.

In 1924, Bohr, Kramers and Slater tried to introduce into microphysics conservation principles that hold only on the average. This attempt was abandoned in the light of the Compton-Simon experiment (and its later refinements). Since that time, except for a moment of doubt in 1936, it has been thought that the classical conservation laws (for energy and momentum) hold in quantum theory for each individual interaction, in a way that yields the classical exchange-and-balance of momentum (or energy) familiar from the laws of elastic collisions. It has been thought, that is, that in each individual “collision” what one part of the total system loses in linear momentum (say) another part gains, so as to maintain the same total amount afterwards as before. To those familiar with discussions of the interpretation of quantum theory, however, it will be apparent that the very concepts needed to express this idea of an elastic collision are generally not admitted in the theory. For one needs the idea that both before and after collision the total system has a well-defined value for the conserved quantity and, moreover, that the various component parts of the system have well-defined values for those quantities out of which the conserved one is composed. But in the case of spin, for example, it is customary to say that although total spin may be conserved in certain interactions one cannot attribute values to the separate components of spin (in various directions) because the associated operators do not commute. (Thus the whole sum is not even the sum of its parts.) Moreover, one does not generally refer to the values of quantities except in eigenstates. Hence, in general, one would not refer to the value of the conserved quantity before and after interaction, except for interactions initiated in eigenstates.

From 1914 on Russell's epistemology was dominated by the attempt to show how we come by our knowledge of the external world. As he gradually became aware of the inadequacies of the “pure empiricist” approach, Russell realized that his program was viable only insofar as certain postulates of inference were allowed. In this paper I trace the development of the structural postulates from Analysis of Matter to Human Knowledge. The basic continuity of Russell's thought is established. Certain confusions implicit in the various formulations of the postulates are brought to light. Finally, it is argued that the viability of Russell's program rests on a larger number of independent postulates than he thought were needed. Some implications of Russell's work for current work in the philosophy of science are briefly sketched.

John Rawls's A Theory of Justice was published in December 1971 and has already established itself as a landmark. No other philosophical work, in our time or before, has, to my knowledge, excited so much attention in so short a time and in such varied circles. Clearly the book answers to a set of needs that have just recently surfaced, and it was published at just the right time to benefit from changing directions in philosophy and other areas of intellectual life brought on by enormous and accelerating changes in social conditions and concerns, by the disaster of Vietnam, and by the sense that something serious and sufficient must be done to counter the increasing fragmentation of knowledge and the divorce of science from society. Rawls gives one the sense of putting it all together; of seeing things clearly and seeing them whole; of joining together again economics, jurisprudence, and social and moral theory; and of putting philosophy to work once again in the service of society and humanity. In particular, he gives one the sense that there can be a science of justice, of morality, and of values.