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The first chapter contains splendid definitions and a new classification of exercises of speed, effort and endurance. Chapters two to six are devoted to physiology of exercise; they contain the results of laboratory and clinical findings on the behavior of the muscles, heart, lungs, the organs of nutrition and excretion, and the nervous system during and after different forms of exercise; also, modifications produced by differences in age, sex and occupation. The two chapters devoted to the effects of violent exercise on the heart are of particular interest at this time when the subject is the cause of widespread discussion by physicians, and educators, and giving much concern to the parents of boys and young men interested in athletics. After reviewing the literature on the subject and citing a number of cases from his own wide experience, Dr. McKenzie arrives at the following conclusion: "After the most severe strain one can seldom find any measurable injury in a week's time in a heart originally sound if the athlete has not passed thirty. It is in those unprepared for violent exercise, and es,pecially when approaching middle life, that the danger of heart strain is most imminent." A classification of athletic and gymnastic exercises and games on the basis of the regions of the body used; the demand on nerve control; the influence on pulse, blood pressure, and respiration; the physical characteristics cultivated; and the best age for practise should prove of great value to the individual and the practitioner in solving the problem of exercise for the sedentary man. The remaining eleven chapters in Part I. treat in detail of the various systems of physical education in different countries, physical education and athletics in schools, colleges, municipal and philanthropic institutions, and the special methods applied to the training of the blind, deaf mute, and mental and moral defectives. In Part II., the first three chapters treat of the application of exercise, massage, vibration, and passive exercise to pathological conditions. The remaining thirteen chapters deal with the treatment by exercise of flat-foot, club-foot, round back, stooped and uneven shoulders, scoliosis, abdominal weakness and hernia, visceroptosis and constipation, diseases of the respiratory and circulatory organs, obesity, nerve pain and exhaustion, tic, stammering, chorea, infantile paralysis and locomotor ataxia. The author has succeeded admirably in presenting clearly the methods of diagnosis and treatment of the various abnormal conditions which may be improved or corrected by exercise, manipulation and massage. The critical discussion of the various methods advocated for the treatment of hernia, scoliosis, diseases of the circulatory and respiratory organs, and obesity, is particularly valuable because of the author's long and successful experience in the treatment of these conditions. A large number of diagrams, line drawings and photographs illustrating physical defects, exercises and equipment add materially to the value of the book. This book fairly represents the present status of physical education and mechano-therapy; its use as a guide and reference work by educators, teachers, physicians and other scientists interested in the physical development and improvement of man should aid materially in placing exercise on a scientific basis. GEORGE L. MEYLAN

science

<i>Electrical Engineering</i> . By Charles Proteus Steinmetz. Fourth edition. Entirely revised and reset. 368 pp., 194 illustrations. McGraw-Hill Book Co.

Electrical Engineering . By Charles Proteus Steinmetz. Fourth edition. Entirely revised and reset. 368 pp., 194 illustrations. McGraw-Hill Book Co.