G79 



experiments on dogs that the albuuiinoid substances of meat, casein, 

 lentils, and j>luten possessed nearly the same v^alues for food, while the 

 albuminoids of lu])ine were considerably inferior. Gabriel takes excep- 

 tion to the results of this last experiment, particularly to those relating 

 to the albuminoids of lupine. 



The following experiments on the nutritive value of certain albumi- 

 noids were made by Gabriel, at the suggestion of II. Weiske. The 

 original plan was to feed a mixture of albuminoid materials and starch 

 to geese, but as the geese were nearly dead at the end of two weeks a 

 sheep was used for the trial instead. The experiment was divided into 

 eight periods, from 7 to 13 days each, in all of which the food was the 

 same (500 grams of barley straw, containing 3.25 grams of nitrogen, and 

 8 grams of salt per day), except the albuminoid materials, which were 

 changed each period. Egg albumin, casein, conglutin (from lupine), 

 rye meal, pea meal, ground meat, and gelatin were each fed with the 

 barley straw for one period, and in quantities furnishing 9 grams of 

 nitrogen per day. In the eighth period the nitrogeiious food was 

 replaced by a like amount of starch. The main results, as indicated by 

 the balance of the nitrogen consumed and excreted, are expressed in the 

 following table : 



Nitrogen halance. 



o Including undigested food and metabolic products. 

 b In straw and supplementary food. 

 cNo albuminoid added to the straw. 



din straw. 



e Excreted in faces in e.xcess of amount 

 in food. 



The amount of nitrogen stored with the three albuminoid prep- 

 arations, egg albumin, casein, and conglutin, varied somewhat and was 

 in the order named. The results with the albuminoid bodies contained 

 in the different feeding stuffs diflered much more widely. The smallest 

 amount of nitrogen laid on was with the rye; that with ground meat 

 was the largest; and that with peas was about midway between the 

 two. In general the amount of nitrogen stored in the body was 

 inversely proportional to the amount digested. 



During the 12 days when gelatin was fed no change was observed in 

 the animal. Experiments by Voit* have shown that gelatinous sub- 



* Zeitsch. f. Biologie, 8, pp. 297-387. 



