THE RELATIONS OF METABOLISM TO FOOD-SUPPLY. 143. 
grams of food nitrogen per kilogram live weight, give the following 
figures for thé minimum nitrogen requirements of the dog and of 
man as compared with cattle: 
Experiments on Dogs. 
0.235 gram. 
0.243 “ 
IM atk iss, bo er geiciarans aa ee tare Satin Oe oe te Sat 0.269 « 
0.3815 “ 
AVeTage... 6... eee cece 0.266 “ 
>0.226 “ 
0.203 “ 
0.185 “ 
Voit & Korkunoff...................8. >0.204 “ 
<0.176 “ 
<0.149 <“ 
<0.187 “ 
Experiments on Man. 
| 0.190 “ 
0.180 “ 
Lehmann ethos cee. a oa deea sis as caw \9 ‘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 large amounts of carbohydrate material which 
they habitually consume does not clearly appear. 
Errects upon Heatty.—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 observations have 
also been made by Rosenheim.* These experimenters ascribe 
* Arch. ges. Physiol., 54, 61. 
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