THE RELATIONS OF METABOLISM TO FOOD-SUPPLY. 127. 
save one the gain of nitrogen by the body showed a marked increase, 
and this, it is to be noted, after the feeding had been continued for 
a considerable time. The one exceptional case, on wheat straw, 
is readily explained by the obvious effect of this material in increas- 
ing the metabolic nitrogen of the feces and thus diminishing the 
apparent digestibility of the protein of the ration. Had account 
been taken of these metabolic products, the increased gain of 
nitrogen by the animals would doubtless have been more marked 
in allcases. This gain, it would seem, may fairly be ascribed to the 
large additions of digestible non-nitrogenous matter derived from 
the hay or straw added. 
CoMPaARATIVE Errects or FaT AND CARBOHYDRATES.—C. Voit * 
found the hexose carbohydrates to be superior to fat in diminishing 
the proteid metabolism. He gives the following comparisons: 
Food per Day. rea 
Date. per Day, 
Meat, Carbohydrates or Fat, Grms. 
Grms. Grms. 
Nov. 16-22, 1857............... 150 150-350 sugar 13.4 
22-Dec. 2, 1857 ........... 150 250 fat 15.6 
Oct. 28-Nov. 8, 1857........... 176 100-364 starch 15.1 
Nov. 8-15, Bee ins cies eae AS 176 250 fat 16.2 
Feb, 23-25, 1861........-05000. 400 200 fat 31.9 
1s 1. ee ee eee eee 400 250 starch 30.5 
« 28-Mch. 3, 1861 ........... 400 250 sugar 30.3 
June 19-23, 1859............... 500 250 fat 38.5 
ie Oe a aed 5 a oats a 500 300 sugar 32.7 
96-29, os che mes oes 500 200 “ 35.6 
« 29-July 2, 1859 ........... 500 100 “ 37.9 
Feb. 17-22, 1865............... 800 250 starch 52.8 
OO DD ae ge io die wire Saas 800 200 fat 54.7 
July 23-26, 1864............... 1000 0 73.5 
oe 36, FT ne hase aceets its 1000 100 starch 68.5 
« 27, Oto chads Sariatineteele 1000 400 “ 60.2 
“ 97 Aug. 1, 1864 .......-45- 1000 0 79.6 
ie 1 TRAE sc 5s vances smnawe ed 1000 100 fat 74.5 
BE I sh eek etna aye picasa ERTS 1000 300 “ 69.3 
ab the eee NOR aioe nea ert 1000 0 80.2 
J 1D. VB59 ws see wie se8 wile site os 2000 200-300 starch 128.4 
ec ap. o soe acer n toss 3H 2000 250 fat 135.9 
* Zeit. f. Biol., 5, 447. 
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