Professor Thorndike needs no introduction. Neither, it would seem, does the book calledThe Prediction of Vocational Success,in which he and his associates recorded the findings and conclusions of their study of that subject. It has attracted widespread attention, particularly among persons concerned with problems of educational and vocational guidance. It has drawn the fire of competent critics, which speaks rather well for it. Dr. Thorndike is the kind of scientist whose works and words carry the weight of authority, but he is also the kind of authority who can take a scientific attitude toward criticism. He calls the following rejoinder to two of the marksmen “Rebounds from the Target”—but “rebounds” is perhaps a mild term for some of his return shots. We gather, too, that in his opinion, some of the shots fired by Professor Paterson and Mr. Macrae in the October issue ofOccupationswere more or less in the nature of duds or fell entirely outside the mark. Be that as it may, here is Professor Thorndike to speak for himself. If he needs no introduction, he also needs n