THE FOOD AS A SOURCE OF ENERGY. 277 
Baek Stas wee in raya 
acca Nitrogen. | PerGea.,| eto.” | Per Grime 
als. Cals. Cals. 
Paraglobulin 15.6 5.634 1.263 4.371 
Egg albumin 15.7 5.577 1.270 4.307 
Case asic tesa oa hens ae Pe Gee 5 15.2 5.715 1.311 4.404 
POYMEOMIN 5s ssce cists aeacaven dss leanieia anne 16.6 5.754 1.329 4.424 
WIDTD) 56 022k Vadnais» wed ode 16.6 5.508 1.329 4.179 
Lean meat ...............0 ee eee 15.4 5.345 1.345 4.000 
Conglutin os oa disie es ss saci aa ave 17.5 5.359 1.390 3.969 
Crystallized albumin ............ 19.2 5.595 1.555 4.090 
Nitrogenous body tissue ......... 15.4 5.345 1.503 3.842 
§ 2. Experiments on Man. 
Protrein.—Rubner * has also reported a single experiment on a 
man upon a diet of meat with a slight addition of fat. The results, 
expressed in the same manner as those given in the preceding sec- 
tion, that is, per gram of dry matter of the meat, were— 
Energy of food. ..... 0... ccc eee ence ecw 5.599 Cals, 
te ACCES. ciexe ws . 0.484 Cals. 
6 OF UPNE sei ecccae sees 1.027 
Metabolizable energy....... .. 4.1388 “ 
5.599 “ 5.599“ 
Quite a number of determinations are on record of the ratio be- 
tween the nitrogen and the energy content of human urine. Rub- 
ner { reports the following results upon various diets, including the 
experiment on meat just quoted: 
Diet. mW 
Mother’s milk... .......0 0. cece eee cee 12.10 Cals. 
Cow’s milk—infant. ........c0. cece eee eee 6.93 
te & —adult.........2006 ee were gia ehees 7.71 & 
Mixed diet, poor in fat. . ies Vbaseewecs Gor. 28 
OG Ey OE ac hve Late Nr eects oho Sap 7 Suge. 
& “rich in fat........... Oe oe 8.87 
CO A ao cigs 6h ig guests eseleads\ uber 8.44 “ 
2 |, ne eee. 6.42 « 
Mixed diet—boy........-.. cs. ceeeeeeeseeseees 1.50 
MOSES ccc o cca cade BPH OR ESS waver Te09 
Potatoes. . SO Mem eta i aesaslesndies 7.85 * 
* Zeit. b ‘Biol, 42, 272. 7} Ibid., p. 302. 
