EXPERIMENT STATION BULLETINS. 521 



inf? perccntases of volatiln nitroson in the feces, and inasmuch as it appears 

 with the undigested food it should Ije talven into consideration, else our co-efficients 

 of digestibility are considerably too high. (See Penn, Report, page 272-273, year 

 1900-1901.) 



REAL EFFECT OF SUCCULENCE. 



Whatever the effect on the apparent digestibility of a food, which in these in- 

 stances seems to be practically nil, it seems quite positive that a succulent food is 

 digested at less expense than a dry food. In this way a succulent food should 

 work antagonistic to a food rich in fiber and in the same capacity as grain. If an 

 increase of cell oxidation is accompanied by an increase of metabolic nitrogen 

 in the feces (Penn, Report, 1900-1901, p. 273, compare with Armsby, then surely 

 the expenditure of energy on a food high in factors of succulence is less than 

 on a dry food. The above being true, it follows that the net available energy, 

 other factors being equal, is greater in a succulent feed than in a dry one. 



ACKNOWLEDGMENT. 



During the winter of 1902 and 1903 Mr. Lyman Carrier, B. S., did efficient work 

 in superintending the experiment as conducted in the barns, and likewise Mr. 

 p. H. Wessels during 1903 and 1904. 



Miss Dorothea Moxness, the efficient assistant in the laboratory, is to be com- 

 mended for her painstaking help in the analytical work herein recorded. 



BIBLIOGRAPHy. 



The following publications have been used as references in the various phases 

 of the matter under discussion: 



1. Bui. 42 Penna. Sta. 



2. Landwirtschaftlichen Versuchs Stationen, 44, 47, 50. 



3. Journal Am. Chem. Society. Vols. 19, 20. 



4. Halliburton's text boolv of Physiological and Pathological chemistry. 



5. Bunge, Lehrbuch der Physilogische und Pathologische Chemie. 



6. Bui. 85, office of Expt. Sta., Nutritive Value of Bread. 



7. Penna. Report, 1900-1901. 



8. Bui. 12G, Office of Experiment Station. 



9. Armsby, The Principles of Animal Nutrition. 

 10. Bui. 141, Geneva Exp. Sta. 



66 



