THE FOOD AS A SOURCE OF ENERGY. 291 
with Period 6, on the same ration with the addition of molasses. 
Comparing, first, the organic matter of the two rations we have 
the following: 
Total Organic Organic Matter in 
Matter Fed, Molasses, 
. Grms. Grms. 
Period 6 4.esis-c ais een dromad eau sans 8262 1702 
eee BL aisle Soave ah gualdid caked axdasee gee 6630 0 
1632 1702 
In the period with molasses 70 grams less of the basal ration 
was consumed than in the period without, and a correction must 
accordingly be made for this in the way explained on page 288. 
The energy of food and excreta in the two experiments (that 
of the urine being corrected to nitrogen equilibrium), together with 
the correction for the 70 grams of organic matter, is shown in the 
following table: 
aaa F Metaboliz- 
Gets | Ge | TEaR | MGARR |abtedEperey, 
Period 6........ 37,946.2 | 11,365.8 | 1,786.1 | 2,397.9 | 22,396.4 
SOBs Aesth Bt 31,327 .8 9,599 .2 1,530.0 2,560.7 .| 17,637.9 
6,618.4 1,766.6 256.1 —162.8 4,758.5 
Correction ....| +330.8 +101.3 '+16.2 + 27.0 +186.3 
6,949.2 | 1,867.9 ' 272.3 | 135.8 | 4,944.8 
Dividing the metabolizable energy of the molasses, 4944.8 Cals., 
by the number of grams consumed, 1702, gives the metabolizable 
energy of 1 gram of organic matter as 2.905 Cals. 
ReaL AND APPARENT METABOLIZABLE ENERGy.—The above 
figures, however, demand more critical discussion. While the addi- 
tion of molasses to the basal ration increased the amount of poten- 
tial energy carried off in the feces and urine, it diminished that in 
the methane; that is, it acted in some way to check the fermen- 
tation in the digestive tract to which this gas owes its origin. In 
other words, under the influence of the molasses the loss of energy 
by fermentation of the basal ration was diminished by 135.8 Cals., 
and this amount, by the method of computation, is added to the 
metabolizable energy of the molasses. 
