My last communication dealt with the question of what is an atom. The answer was a proposal to define the atom as the terminus of a special sort of analysis, the atomistic-structural. This form of analysis was presented as a special way of treating a “material” system or situation. A formula was suggested which expressed matter or the material as the product of structure and atomicity, or M = SA. No limitation was placed on the factoring of M into other products, but this particular product was designated as the structural-atomistic analysis. The factors, S and A, constitute a conjugate pair, so chosen that each member of the pair is meaningless without the other. Atomicity, thus, is not a matter of size or of some sort of ultimateness, but corresponds to some level of being in empirical situations which also reveals structure.

No philosopher is needed to say where reality may be found. The fool no less than the wise man is in direct touch with real existence at every moment of his waking or dreaming life. To find reality might be a problem for timeless gods beyond the flux of nature—if timeless gods can be said to have problems—but natural creatures encounter reality at every turn. Nor need we look to the philosopher for knowledge. A division of labor having been made between philosopher and scientist, it is to the scientist that we turn for most of our knowledge. Nevertheless, tasks for the philosopher remain and one of these is to make clear what knowledge is, for, to have knowledge is one thing; to know what knowledge is, is another. Science, we may safely assume, constitutes our best claim to knowledge but not all who know their science can say why it is knowledge.

There is a considerable literature about causation. A great many investigators constantly employ the notion of causation in some form. But with the exception of a very few items, these investigators will find little of use in this literature.

What I propose to do in the present paper is to clarify critical realism on some crucial points. While such is my primary purpose, I also entertain the hope that logical positivists and pragmatists may be led to see in this form of realism a necessary supplementation to their emphases and insights. I am persuaded that there has been misunderstanding and prejudice at work partly because of verbal phobias in connection with such phrases as the copy-theory, representative perception, transcendence, the subjective, Cartesian dualism, etc., etc. So strong have these accumulated prejudices been that, in America at least, there has been a tendency to outlaw epistemology. I do not find the same situation in England for instance. Here it seems at times as though pragmatism and positivism have consciously “ganged up” against epistemology—in my opinion to the hurt of philosophy. I have the impression that the younger philosophers in America are bewildered and are largely drifting. Under these conditions it is the duty of any one who believes that he has a clear-cut epistemology capable of rising above these verbal phobias to seek to present it as precisely as possible.

Many attempts have been made in recent months to throw light on the problem of vagueness. That perfect precision is an ideal not to be attained by any language seems clear. But the obvious fact is that words and sentences in our languages are not so precise as we should like to have them, and we are naturally concerned with finding some sort of device by which vagueness can, in the first place, be detected and measured, and, in the second place, eliminated or reduced to a minimum. I shall not be concerned in what follows with these various special attempts to meet the problem. My task is the somewhat more general one of showing that there are other factors contributing to vagueness, one of which is of particular significance when we leave the realm of ostensively defined symbols and begin to concern ourselves with suppositional symbols, constructs and hypotheses.

There can be no possible quarrel with the assertion that the phenomena of value are amenable to scientific treatment if the statement is taken in an obvious sense, for the act of valuation is a fact of human experience, empirically observable in the same way as any other fact. There is therefore no reason why we should not deal with certain aspects of the phenomena of value as we deal with other empirical phenomena. To deny this would be to deny scientific status to sociology, anthropology, and psychology. Sometimes one encounters such denials, but they need not be taken seriously, for they are obviously grounded on a very arbitrary and narrow definition of science.

It is the purpose of this paper to carry out a partial syntactical analysis of imperatives. Imperatives form a large body of linguistic expressions, appearing, e.g. in mathematical proofs (“Let f(x) be a continuous function!”), laws, moral injunctions, instruction, etc. For analytical purposes we distinguish between two forms of imperatives, the fiat and the directive. By a directive we mean an imperative which includes an indication of the agent who is to carry it out. For example, “Henry, don't forget to stop at the grocery!” is a directive. By a fiat we mean an imperative which includes no reference to an agent who is to carry it out. For example, “Let there be light!” is a fiat. This is a distinction made in terms of meaning. If, however, proper symbolic devices were introduced for the formalization of imperatives, it could be made in a syntactical manner. Thus we could distinguish between imperatives which possess a certain operator—the directive operator formed by putting a name within square brackets—as “[Henry] (Let it be the case that Henry does not forget to stop at the grocery)!”, and imperatives which do not possess this operator, e.g. “Let it be the case that Henry does not forget to stop at the grocery!” In the following we pay attention only to fiats. This, of course, involves a great limitation of subject matter and excludes topics of great interest.

An examination of philosophical conclusions and psychological experimentation upon the nature of the emotions raises numerous complex and controversial problems. The terms employed, viz. “the life of feeling”, “instinct”, “imagination” and “emotion” are integral to epistemology, ethics and aesthetics. In epistemology, the teleological aspect of the emotions is of importance. In ethics, the Stoics gave impetus to the demand that the emotions be controlled, a demand that reached its culmination in the Kantian formalism. In aesthetics, the acceptance of the “sensuous medium” as the material of art has implied “feeling” as its subjective counterpart. Yet, the full implications may not be drawn in these particular fields until analysis of the emotions themselves may relate these terms and give them precise and systematic definition.