D. Appleton & Co.'s New Publications. 



The Source of Muscular Power. 



By Austin Flint, Jr., M. D., author of "Physiology of Man, designed 

 to represent the Existing State of Physiological Science as applied 

 to the Functions of the Human Body," etc. 1 vol., 12mo. Price, 



$1.00. 



"There are few questions relating to Physiology of greater importance than the one 

 discussed in this volume. Nor is there any scientific question which ought to command 

 more popular interest, when we consider how much attention is given to athletic ex- 

 ercises at our schools and universities. Is extraordinary muscular exertion performed 

 at the expense of the tissues, or does it merely represent the conversion of food into 

 f 0rC e— the muscular system being only the medium, and not the source, of the dynami- 

 cal operation. The author concludes, from experiments, that the direct source of dy- 

 namic action in the living body is to be looked for in the muscular system itself. The 

 exercise of the muscles immediately involves the destruction of a certain amount of 

 muscular substance, of which the nitrogen excreted is a measure. Indirectly, nitrogen- 

 ized food is an aliment of power, since through assimilation by the muscular tissue it 

 repairs waste and develops capacity for work. But food is not directly converted into 

 force in the animal mechanism, nor is it in any sense a source of dynamic action, ex- 

 cept as it maintains the muscular system in a proper condition for exertion. That is 

 the conclusion which Dr. Flint seems to have grounded on sure foundations, although 

 it is diametrically opposed to the current opinion among physiologists in recent years." 

 —New York Sun. 



The Physiology of Mind. 



Being the First Part of a third edition, revised, enlarged, and in 

 great part rewritten, of " The Physiology and Pathology of Mind." 

 By Henry Maudsley, M. D. 1 vol., 12mo. Cloth. Price, $2.00- 



" ' The Physiology of Mind, 1 by Dr. Maudsley, is a very engaging volume to read, 

 as it is a fresh and vigorous statement of the doctrines of a growing scientific school 

 on & subject of transcendent moment, and, besides many new facts and important views 

 brought out in the text, is enriched by an instructive display of notes and quotations 

 from authoritative writers upon physiology and psychology; and by illustrative cases, 

 which add materially to the interest of the book."— Popular Science MontMy. 



Physiological /Esthetics. 



By Grant Allen, B. A. 1 voL, 12mo. Cloth. Price, $1.50. 



" Mr. Grant Allen has seized on a subject that is entirely ignored by physiological 

 treatises, while those who have handled it from a psychological point of view have in 

 general been ignorant of physiology. Mr. Grant Allen has. read widely, and has read 

 well, while he suggests several very interesting explanations of mental condition that 

 have hitherto been involved in hopeless obscurity." — The Lancet. 



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