THE FOOD AS A SOURCE OF ENERGY. 277 
Bene oe aoe in seetepelia 
Supe. Nimeed | PecGrn,;| ea,” | Berane 
: Cals. Cals. Cals. 
Paraglobulin ................... 15.6 5.634 1.263 4.371 
Egg albumin ................... 15.7 5.577 1.270 4.307 
Caselli. ...0 asccjecia ve nigea va geneies 15.2 5.715 1.311 4.404 
Syntoni gross cages eae esa ew 16.6 5.754 1.329 4.424 
FAbrin os 5 cates tebe rises ee 16.6 5.508 1.329 4.179 
Lean meat .........-- 0. cee eee 15.4 5.345 1.345 4.000 
Conglutin .............0.000000, 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. ......... 0.5.2.0. cee eee ... 5.599 Cals. 
BE EE ACCOS cca cies csiceaa vee 0.434 Cals. 
BUMPING oie 5. wea eca ve as 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: 
’ Energy Per Grm., 
Diet. Ribroren, 
Mother’s milk... .......... 002 eee ee ee eee 12.10 aa 
Cow’s milk—infant. .........0..0 00. cee ee eee 6.93 
8 BE oe MOU ese bigs ee ee ay j eachede ee de 7.71 “ 
Mixed diet, poor in fat. . ieciweediesatnan ORO = 
EB Os arate Ys iis afsiane Pema ances 8.33 “ 
 vich In fat... coeecewe eee ee ee eee 3 8.87 “ 
es EE EEE CEOs os cs “hp aadelarslenstaetin ts 8.44 “ 
OEE AE AE EEE DOV is o wis 8s 25s eet car eae 6.42 “ 
Mixed diet—Dboy........ 0... cesses ee eeeeeeeee es 2.50 
MGA 5c athaia cieera a dane area er Weheae 7.69 “ 
POtstOCBcgscarrcay adanale de ae cae Re Midwes 7.85 “ 
¥ Zeit. f. Biol, 42, 272. { Ibid., p. 302. 
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