THE RELATIONS OF METABOLISM TO FOOD-SUPPLY. 143 
grams of food nitrogen per kilogram live weight, give the following 
figures for the minimum nitrogen requirements of the dog and of 
man as compared with cattle: 
Experiments on Dogs. 
0.235 gram, 
0.243 “ 
Munkseic ocksie heat wyohet oud kesecais 0.269 « 
0.315 “ 
Average..... 0... e cece eee 0.266 “ 
>0.226 “ 
0.203“ 
0.185 
Voit & Korkunoff................00.. >0.204 “ 
<0.176 “ 
<0.149 “ 
<0.187 “ 
Experiments on Man. 
0.190 “ 
0.180 “ 
Lehmann ef al... 1... ccc neces 0.090 « 
0.180 “ 
Experiments on Cattle. 
Range of experiments cited ........ 0.064-0.098 gram. 
Only one of the results on man, together with the very low 
figure obtained by Sivén (p. 139), is comparable with those reached. 
with cattle. Whether we are to ascribe the small demand of the 
latter for proteids to a specific difference in their rate of meta- 
bolism or to the Jarge amounts of carbohydrate material which 
they habitually consume does not clearly appear. 
Errects upon Heavrtu.—Munk, in his experiments with rations 
very poor in proteids, made the observation that while such raticns 
were adequate to maintain the nitrogen balance of the body they 
nevertheless appeared to produce, in time, profound functional dis- 
turbances, sometimes ending in death. Similar cbservations have 
also been made by Rosenheim.* These experimenters ascribe 
* Arch. ges. Physiol., 54, 61. 
