Speech and Hearing.

The author has had probably more experience with the various problems of the acoustic field than almost any one else interested in these lines. This work stresses among many other subjects the mechanism of speech, the physical properties of musical sounds and noises, the mechanism of hearing, and many facts relating to speech, music and allied subjects. There are many diagrams illustrating the appliances used, as well as curves derived from various experimental phases of the subject. The observations are well presented with the minimal use of mathematics. Therefore, most of its contents are fairly well adapted for readers who are not well educated along the lines of physics and mathematics. The book ought to be of considerable interest to otologists, to students of speech defects, to men interested in audiometers, and to those desirous of learning facts regarding telephones and the important part they play in the life of