574 



SCIENCE 



[N. S. Vol. XLni. No. 1112 



The first chapter contains splendid defini- 

 tions 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 differ- 

 ent forms of exercise; also, modifications pro- 

 duced 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 especially 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 con- 

 trol ; the infiuence on pulse, blood pressure, and 

 respiration; the physical characteristics cul- 

 tivated; 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 phys- 

 ical 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 H., 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 fiat-foot, club-foot. 



round back, stooped and uneven shoulders, 

 scoliosis, abdominal weakness and hernia, vis- 

 ceroptosis 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 pre- 

 senting clearly the methods of diagnosis and 

 treatment of the various abnormal conditions 

 which may be improved or corrected by exer- 

 cise, 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 refer- 

 ence 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 scien- 

 tific basis. George L. Meylaii 



Columbia University 



Electrical Engineering. By Chaeles Proteus 

 Steinmetz. Fourth edition. Entirely re- 

 vised and reset. 368 pp., 194 illustrations. 

 McGraw-Hill Book Co. 

 Since the appearance in 1901 of Steinmetz's 

 " Theoretical Elements of Electrical Engi- 

 neering " the art of electrical engineering has 

 progressed so rapidly that four editions of the 

 book have been necessary to keep it up to date. 

 The present edition is not merely a reprint 

 from former ones but has been thoroughly 

 revised and rewritten. Some matter which ap- 

 peared in former editions has been withdrawn 

 and new matter has been added with the idea 

 of preserving the unity of the book and at the 

 same time making it representative of theory 

 and practise as it exists to-day. 



The text is divided into two parts, the first 



