CHEMICAL DYNAMICS OF ANIMAL NUTRITION 129 



investigated. As a result of these researches, certain conclusions have 

 been drawn as to the general chemical mechanism of nutrition, and as 

 to the role played by the nitrogenous food-stuffs (Part VI). 



Another problem, also bearing directly on the general chemical 

 dynamics of nutrition has been investigated, and certain preliminary 

 results obtained. Hofmeister has stated his belief that coagulablc 

 albumens can be synthesized from peptones or albumoses in the 

 mucous membrane of the stomach. Glaessner, working in Hofmcister's 

 laboratory, obtained experimental results tending to confirm this 

 hypothesis. As, for reasons discussed in Part II, there are certain 

 objections to the experimental method employed, and as, further- 

 more by the analytical processes used in this work, the coagulable 

 albumen can be directly estimated, the researches of Hofmeister and 

 Glaessner have been repeated. The experiments are described in 

 Part IV. They do not confirm the results of Hofmeister and 

 Glaessner. 



REFERENCES 



1. Speck, Ascher and Sfiro's Ergebnisse der Physiol. Bio-Chem. Abth. 2, p. I, 1903. 



2. Sivn, Skandina-vische Arch, der Physiol. 1 1, p. 320, I got. 



3. Chittenden, Physiological Economy of Nutrition, London, 1905. 



4. Folin, American Journ. of Physiol., 13, p. 118, 1905. 



5. Lane-Claypon and Schryver, Journ. Physiol., 31, p. 169, 1904. 



6. Schryver, Journ. Physiol., 32, p. 159, 1905. 



PART II 



ON THE METHOD FOR ESTIMATING RESIDUAL NITROGEN IN SERUM 



AND TISSUES 



Attention has often been called to the difficulty of precipitating 

 albumenous bodies without at the same time removing from solution 

 substances which are otherwise easily soluble in water. This subject 

 has been investigated recently by Haslam, who has demonstrated certain 

 fallacies in the methods devised for the separation of albumoses by 

 fractional precipitation with salts. S. N. Pinkus (private communica- 

 tion) has obtained similar results. 



In the previous work on autolysis in the papers already quoted, 

 the nitrogen of the non-coagulable bodies has been estimated in the 



