i;6 SCIENCE PROGRESS 



activity ; conversion, if they are represented by sensory, motor or ideational 

 changes ; " dramatization," " condensation," and other words are employed in these 

 analytic examinations in such a way as to demonstrate a wealth of imagination 

 hitherto unthought of. It is claimed by his supporters that the work of Freud is, 

 tothe neuroses, what Hume described the law of association to be in the realm of 

 mind, or gravitation in that of matter ; but, without derogating from its value in the 

 interpretation of abnormal mental phenomena, it is impossible to subscribe to many 

 of the explanations offered by his advocates. All dreams are not the product of 

 repressed causes, nor is forgetfulness a designed exclusion or a purposeful 

 repression from consciousness ; nevertheless, this little Freudian handbook will be 

 of much help to those interested in mental phenomena. 



Robert Armstrong-Jones, M.D. 



The Effect of Diet on Endurance. By Irving Fisher, Ph.D., Professor of 

 Political Economy, Yale University. [Pp. viii + 55.] New Haven : Yale 

 University Press; London: Oxford University Press, 1918. Price 

 2s. 6d. net.) 

 This little book, which owes its appearance to the necessity for Food Economy 

 imposed by the War, is a reprint, revised and abbreviated, of a communica- 

 tion published in the Transactions of the Connecticut Academy of Arts and 

 Sciences, 1907. 



As the result of an experiment which is fully detailed, the author concludes 

 that, if thorough mastication of food is practised, and if, at the same time, the 

 choice of food is left entirely to instinct, the diet shows a marked reduction in 

 the amount of protein taken. Further, this dietetic change is accompanied by 

 slight loss of weight and strength, but by a marked increase in powers of 

 endurance. The tables, in which the results of the author's experiment are set 

 out, are remarkable not only for the degree of improvement in endurance powers 

 which they show, but also for the fact that there seems to be no relation between 

 the general improvement and the individual improvement in given tests. 



The author recognises that the chief obstacle to prevent most people from 

 following his experiment is the practical impossibility in the average home for 

 the food to be selected by appetite only. He does not attempt to state the 

 converse proposition that, if the amount of protein in the diet is voluntarily reduced 

 and substituted by the required amount of fat and carbo-hydrate, thorough 

 mastication will be sufficient after a few weeks to make the alteration palatable. 



T. B. J. 

 MISCELLANEOUS 



Library Ideals. By Henry E. Legler. Compiled and edited by his son, Henry 

 M. LEGLER. [Pp. x + 78.] (Chicago and London : The Open Court 

 Publishing Company, 1918. Price §1.50 net.) 



The late Mr. Henry E. Legler was for some years Librarian of the Chicago 

 Public Library, after serving previously as Secretary to the Milwaukee Board of 

 Education and Secretary of the Wisconsin Free Library Commission. His son, 

 Mr. Henry M. Legler, has compiled and edited, in the present volume, some essays 

 and addresses on library work delivered by his father on various occasions. 



In these essays the author explains to us his library ideals. He is a firm 

 believer in the power of Free Libraries to further the development of a rea 

 democracy, to make rural life as attractive as city life, to encourage adult 

 education, to develop the technical resources of the country and to weld together 



