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The contributions to this field since the last summary was published (54) still follow the previous trend. There are a number of discussions of auditory theory, on the one hand and, on the other, a large number of experimental investigations which directly or indirectly fortify the theoretical points of view assumed in the studies. In addition there are facts which appertain to the higher mental processes, including musical appreciation. In the present summary the compiler has attempted to include the more important theoretical and experimental researches in this rather broad field, realizing that many contributions have been either purposely omitted, for the reason that available space must be given to more typical and critical studies, or they have been unintentionally overlooked since many periodicals are not available to the compiler at this time. The Psychological Abstracts, however, have brought some of these articles to the notice of the writer, and they have been outlined wherever their bearing on the subject in hand was pertinent. This study serves as a means of general orientation in the subject, with the possibility of inducing any reader who wishes further enlightenment to consult the original publications. If there have been any serious omissions the author is quite willing to have them brought to his attention.Theory of audition. Again the Young-Helmholtz theory, commonly known as the most important resonance theory, has found stout defenders. In reply to Boring's proposal of a theory that requires a central analysis of sound, Wilkinson (62) brings forward several very important arguments. His attitude in regard to the " all or none " doctrine of nerve impulses, which partly led Boring to give up the resonance theory, is that this theory is not an insuperable barrier to such a resonance theory. He shows that on well established grounds the basilar membrane might still respond sympathetically to individual tones. Also in terms of the refractory period Boring's hypothesis seems to be seriously undermined. The writer points out four positive bits of evidence in support of the resonance theory. As indicated in a previous summary, (52) Hartridge believes ;-229

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