PREFACE TO THE THIRD EDITION. 



IN the present edition the author has availed himself of the 

 valuable contribution of Chittenden, under the title of " Physi- 

 ological Economy of Nutrition," to this portion of Human 

 Physiology. The results of the experiments therein reported 

 he regards as among the most important additions to the physi- 

 ology of nutrition made during the present decade. 



The completion of the work of Atwater and others, as recorded 

 in the publication entitled " Physiological Aspects of the Liquor 

 Problem," has enabled the author to discuss more fully the nutritive 

 value of alcohol. 



Among other topics, either more fully elaborated or introduced 

 for the first time, are : Vegetarianism ; The Identity of Human 

 and Bovine Tuberculosis in connection with the subject of Food; 

 The Experiments of Cannon and others on the Movements of 

 the Stomach and Intestines ; The Influence of Alcohol and Alco- 

 holic Fluids on the Excretion of Uric Acid; Hemolysis and 

 Bacteriolysis; The Effect of Cold on Bacteria with reference 

 to the purification of water in freezing ; and Ovarian and Ab- 

 dominal Pregnancy. 



Many other minor changes have been made in the text, 

 rendered necessary by the advance in Physiology since the publi- 

 cation of the previous edition. 



The author desires to extend his thanks to critics who have 

 pointed out defects in the former edition, which might otherwise 

 have escaped detection, and all of which he hopes have been cor- 

 rected in the present edition. 



APRIL 15, 1905. 



