THE UTILIZATION OF ENERGY. 451 
Metab- | Com- 
Fasti : Per- 
: Metab-| Zable puted | Tce! Gain, | centage 
olism, ° ti Cals. Cals. | Utiliza- 
Cals. | Food, enale tion. 
Cals. . 
Proteids (meat): 
Pettenkofer & Voit.......... 1041 | 1325 | 1225 100 38 | 38.0 
oe 347 | 307 40 13 | 32.5 
4 | 1549 | 1169} 380] 418 | 110.0 
RUDE iis ois eee see sess 944 | 1463 | 1169 294 | 332 | 112.9 
he 2181 | 1169 | 1012 | 805 | 79.6 
43 | 1325 | 920] 405] 250] 61.7 
Graber. seca. sisie arate dees eos { 743 | 1325 | 920 | 405 | 296] 73.1 
Fat: 
554*| 942 565 377 329 87.3 
554*| 1884 565 | 1319 837 63.5 
re 1738 671 | 1067 | 1016 95.2 
466 942 476 466 428 91.8 
Rubner ........ eee eee eee 261 348 266 82 49 59.8 
944 | 1549 963 586 540 92.1 
1086 | 3298 | 1108 | 2190 | 878} 40.1 
Starch : 
: 1098 | 2015 | 1220 795 353 44.4 
Pettenkofer & Voit........ 1098 | 3076 | 1220 | 1856 853 46.0 
554*| 874 616 258 137 53.1 
Rubner (“ carbohydrates’’, as- 
sumed to be starch)........| 944 | 1549 | 1049 500 509 | 101.8 
Cane-sugar : 
Rubner cies dunes eas 451 572 470 102 190 | 186.3 
Cane-sugar and Starch (93 per 
cent. availability) : 
RODE? osc ages alee be ecard sale 302 702 325 377 365 96.8 
While as a whole the results of the computation would seem to 
indicate that the percentage utilization for tissue building is less 
than the percentage availability, the remarkable range of the 
figures and the uncertain basis upon which they are computed do 
not encourage any attempt at a critical discussion. 
Experiments on Man.—The only respiration experiments upon 
man which the writer has been able to find in which any large 
amount of excess food was given are those of Johansson, Lander- 
gren, Sondén & Tigerstedt + already cited on p. 383 in their bearing 
on the subject of digestive work. If we assume, on the basis of 
* Loss on basal ration. 
+ Skand. Arch. f. Physiol., 7, 29. 
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