PREFATOET NOTE. 



IN this edition the chief changes will be found in the articles relat- 

 ing to physiological chemistry, the revision having been deeme'd 

 necessary because of recent advances in this branch of physiology. 

 (Chapters IV., IX., and XI. are those most affected, while minor alter- 

 ations have been made elsewhere as required. 



A few changes have also been made in the chapter on the Blood, 

 in conformance with the more prominent of the present views on the 

 subject. 



In many instances cuts have been replaced by others which illus- 

 trate the text more clearly. 



W. H. ROCKWELL, JR. 



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