THE UTILIZATION OF ENERGY. 477 
UTILIZATION OF METABOLIZABLE ENERGY OF STARCH. 
Real Utiliza- Avparent 
tion as Utilization as 
Animal.| Period, | Computed by | Computed on 
Kellner. p. 461. 
“er Cent. Per Cent. 
Til 2 46.2 50.0 
i 2 49.0 49.2 
ae é 2a 51.3 53.2 
Kihn’s experiments .......... Vv 2b 52 6 53.7 
VI 2b 48.0 48.1 
Li vi | 3 46.8 46.6 
Kellner’s experiments: 
D 2 54.2 53.7 
F 4 63.2 64.8 
Moderate rations........... 4 G 4 65.2 65.8 
H 3 56.2 56.0 
L J 3 55.2 54.8 
Heavy rations ............. | i g oa oe 
Averages: 
Kithn’s experiments ..........]......]...... 49.0 50.0 
Kellner’s experiments: 
Moderate rations.........../......)...... 58.9 58.4 
Heavy rations 24. 2 0c...caes|aeeessfecsias 58.9 61.5 
into the urine. 
In the two cases, then, 87.30 per cent. and 89.89 
per cent. respectively of the potential energy of the digested starch 
was metabolizable. 
Of this metabolizable energy 49.0 per cent. 
and 58.9 per cent. respectively was recovered in the gain. Com- 
bining these figures we have— 
DISTRIBUTION OF ENERGY OF DIGESTED STARCH. 
no of 
: igestion. 2 
In Urine, |In Methane. imilati In Gain 
| Per Cent. | Per Cent Se ‘| Per Cent. 
Building 
Per Cent. 
Kihn’s experiments........... 0 12.70 44.52 42.78 
Kellner’s experiments; 
Moderate rations........... 0 10.11 36.95 52.94 
The final results for the energy recovered in the gain of tissue, 
whether. expressed as a percentage of metabolizable energy or of 
energy of digested matter, are substantially the same numer- 
ically as those reached by the former method of computation, but 
this agreement is purely accidental, and the significance of the 
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