Professor Karl Popper has had a great deal to endure: “expositions” of his ideas which were mere travesties, “refutations” which he had already answered, by anticipation, or which entirely missed the point at issue. One can easily understand why, when he came to publish an English translation of his Logik der Forschung, he decided to keep to the original text; it should at last be clear exactly what he had—and had not—said in 1934. Yet his thinking had by no means stood still since that time; quite naturally, too, he wished to emphasize as much.

The purpose of this article is to examine two major arguments in favour of the philosophical thesis that the meaning of an expression is its use, and not its referent or what it corresponds to. A second philosophical thesis which is closely related to the first is that the study of the ordinary, “actual” uses of certain expressions is not of purely linguistic interest but in fact is a way, probably the only proper way, of solving the problems of traditional philosophy; in the sequel to the present article, we shall examine one major argument in favour of this second thesis. Both theses occupy a place of central importance in the dominant movement in contemporary British philosophy, to which we shall refer as “the philosophy of ordinary language”. Together they seem to constitute the basis of the most characteristic claim of this movement: that traditional philosophic discourse is logically improper and that philosophy is a legitimate cognitive discipline only if it is concerned with “the spatial and temporal phenomenon of language” by describing “the actual use of language”. Both theses are necessary for the justifi cation of this more general claim.

Only one volume has reached us to mark the centenary of Bergson's birth. Is this significant? If a writer lives to an advanced age his centenary usually falls at a time when fashion has turned against him, and the consequent attitudes are perhaps more interestingly gleaned from comparitively informal assessments than from carefully timed publications. In the Nouvelles Littéraires of October 22,1959, there appeared, almost a hundred years to the day after Bergson's birth, a reported discussion on his philosophy between Gaston Berger, Gabriel Marcel, Henri Gouhier, Jean Brun and a young “normalien” Dominique Janicaud.The talk, presumably more or less spontaneous, was naturally desultory. The older participants could always compensate for implicit misgivings by falling back on affectionate personal recollections, and the youngest would perhaps have preferred not to have to say anything at all. The most cogent general estimate was probably M. Jean Brun's, when he described Bergson as in effect making a stand against the danger of specialist appropriation of the dismembered fragments of philosophy by the various branches of science. We have seen this very nearly come about in England, where a fairly narrow linguistic and logical sector alone has been held with any feeling of conviction. What is here exemplified is the difference of outlook on any question that the English Channel makes. I once heard an English professor of English literature say that when reading Emile Legouis' History of English Literature he had some difficulty in persuading himself that his own professional speciality was being dealt with. It is not difficult to see how this comes about. What one nation takes for granted appears to another as excitingly significant.

In his essay “Logical Empiricism”, in the anthology Twentieth Century Philosophy, Professor Feigl writes: “All forms of empiricism agree in repudiating the existence of synthetic a priori knowledge.” 2 Schlick makes the same point even more forcibly: “The empiricism which I represent believes itself to be clear on the point that, as a matter of principle, all propositions are either synthetic a posteriori or tautologous; synthetic a priori propositions seem to it to be a logical impossibility.”3 The denial of synthetic a prioris is a major thesis of the logical empiricist position, being found in the writings of most of the leaders of the movement.4 The reason for its importance is fairly clear. It provides a formula on which the empiricists can base their critique of traditional philosophy. To use Ayer's phrase, denial of the synthetic a priori results in “the elimination of metaphysics”. The philosophical tradition to which the empiricists are opposed and whose “metaphysics” they wish to eliminate can be called, somewhat loosely, rationalism.