PREFACE. 



THE author's experience of twenty years as a teacher of 

 Physiology to medical students has brought him to the con- 

 clusion that in the short time allotted to the study of physi- 

 ology in medical schools students can assimilate only the main 

 facts and principles of this branch of medicine, which lies at 

 the very foundation of a sound knowledge of the healing art; 

 and that even if there were time to investigate the more 

 recondite and abstruse parts of the subject, such an investiga- 

 tion would be profitless during this formative period. In his 

 teaching the author has kept this thought constantly in mind, 

 and in this manual has endeavored to put into a concrete and 

 available form the results of his experience. 



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