Abstract

The following remarks have been stimulated by Mr. A. J. Ayer's recent essay “The Terminology of Sense Data.” In this paper Mr. Ayer restates several of the points he has made in his book The Foundations of Empirical Knowledge. The context of his argument is that of the traditional distinction between two kinds of things, sense data, percepts, phenomenal or direct given-nesses on the one hand and so-called physical objects on the other. In this context, Mr. Ayer's argument is, to my mind, very admirable; so I do not intend to comment on it. In some other contexts, some of his formulations may, I fear, give rise to misunderstandings; these, naturally, are the points on which I wish to comment. But before specifying them, I had better make sure that we are talking about the same thing by briefly restating several of Mr. Ayer's points. With some of these, if I understand them correctly, I find myself in agreement; the merit of some others I shall presently examine.