The aim of this paper is to discuss the relation between the observation basis and the theoretical principles of General Relativity. More specifically, this relation is analyzed with respect to constructive axiomatizations of the observation basis of space-time theories, on the one hand, and in attempts to complete them, on the other. The two approaches exclude one another so that a choice between them is necessary. I argue that the completeness approach is preferable for methodological reasons.

I discuss a broad critique of the classical approach to the foundations of statistical mechanics (SM) offered by N. S. Krylov. He claims that the classical approach is in principle incapable of providing the foundations for interpreting the “laws” of statistical physics. Most intriguing are his arguments against adopting a de facto attitude towards the problem of irreversibility. I argue that the best way to understand his critique is as setting the stage for a positive theory which treats SM as a theory in its own right, involving a completely different conception of a system's state. As the orthodox approach treats SM as an extension of the classical or quantum theories (one which deals with large systems), Krylov is advocating a major break with the traditional view of statistical physics.

This paper involves one crucial assumption; namely, that the statistical predictions of quantum mechanics for Bell's variant of the EPR experiment will continue to be verified as detector efficiencies are improved and the need for coincidence counters is eliminated. This assumption entails that any hidden-variables theory for quantum mechanics must violate Bell's inequality—the inequality derived in Bell (1964). It is shown here that four locality conditions are involved in the derivation of Bell's inequality; and that a violation of any of the four locality conditions will either entail the existence of superluminal influences or the existence of superluminal signals (superluminal influences that can be used to transmit information), if conspiratorial theories can be ruled out. The attempts so far to rule out conspiratorial theories are all found to be rather dubious, but there are other considerations developed here that rule them out convincingly. Finally, it is demonstrated that violations of each of the four locality conditions can be used to transmit information superluminally, if certain auxiliary conditions are satisfied. This is of particular interest because one of these conditions corresponds to a condition dubbed “completeness” by Jon Jarrett. Jarrett and others have suggested that violations of completeness cannot be used to send information superluminally. Demonstrating otherwise is, perhaps, the most significant result obtained in this paper.

An account of the contents of the propositional attitudes is fundamental to the success of the cognitive sciences if, as seems correct, the cognitive sciences do presuppose propositional attitudes. Fodor has recently pointed the way towards a naturalistic explication of mental content in his Psychosemantics (1987). Fodor's theory is a version of the causal theory of meaning and thus inherits many of its virtues, including its intrinsic plausibility. Nevertheless, the proposal may suffer from two deficiencies: (1) It seems not to provide an adequate explanation of misrepresentation. (2) It may also fail, as a species of empiricism, to provide a correct explication of the content of observational concepts and those non-observational concepts whose meaning is to be traced to their causal connections with observational concepts.

There are a number of reasons for doubting the standard view that scientific theories (understood as sets of connected statements) are the best units for investigating scientific continuity and change (that is, research programs continue as long as groups of scientists accept the central tenets of such theories). Here it is argued that one weakness of this approach is that it cannot be used to demarcate adequately scientific communities or conceptual systems (that is, it fails as a classificatory scheme). Recent alternative proposals by Philip Kitcher and David Hull are assessed in terms of their usefulness in demarcating “Darwinism” and the “Darwinians” in the first decade or so after the publication of The Origin of Species, focusing on the case of Charles Lyell.

A “symptomatic act” is an act that is evidence for a state that it has no tendency to cause. In this paper I show that when the evidential value of a symptomatic act might influence subsequent choices, causal decision theory may initially recommend against its own use for those subsequent choices. And if one knows that one will nevertheless use causal decision theory to make those subsequent choices, causal decision theory may favor the one-box solution in Newcomb's problem, and may recommend against making cost-free observations. But if one can control one's future choices, then causal decision theory never recommends against cost-free observation.

We claim that much of the confusion associated with the “tautology problem” about survival of the fittest is due to the mistake of attributing fitness to individuals instead of to types. We argue further that the problem itself cannot be solved merely by taking fitness as the aggregate cause of reproductive success. We suggest that a satisfying explanation must center not on logical analysis of the concept of general adaptedness but on the empirical analysis of single adapted traits and their causal relationship to changes in allele frequencies.

After presenting the major objections raised against standard formulations of the H-D method of theory testing, I identify what seems to be an important element of truth underlying the method. I then draw upon this element in an effort to develop a plausible formulation of the H-D method which avoids the various objections.

A proof is presented that a form of incompleteness in Quantum Mechanics follows directly from the use of unbounded operators. It is then shown that the problems that arise for such operators are not connected to the non-commutativity of many pairs of operators in Quantum Mechanics and hence are an additional source of incompleteness to that which allegedly flows from the EPR paradox. Finally, it will be argued that the problem is not amenable to some simple solutions that will be considered.

The form of argument used by Popper and Miller to attack the concept of probabilistic induction is applied to the slightly different situation in which some evidence undermines a hypothesis. The result is seemingly absurd, thus bringing the form of argument under suspicion.