66 
The Colorado Experiment Station. 
§ 148. The coefficients of digestion found for the proteids with 
the three sheep were 67.56, 64.69 and 66.83. The average is 66.36. 
Bulletin 93, page 38. 
methoxyl group in the saltbush, Atriplex argentea. 
§149. The saltbush hay was examined for the presence of this 
substance in the same manner that the other fodders were ex¬ 
amined. The amount found was 2.104 per cent. I assume that the 
difference in the amount of this group present in the orts and in the 
hay is so small that no serious error is made in considering them the 
same, and I, therefore, made no attempt to determine this group 
in the orts. The amount in the feces is 2.929 per cent. The total 
weight of this group consumed was 338.49 grams; the amount 
voided was 255.90 grams; the amount digested was 82.6 grams, or 
24.40 per cent. 
§150. Alfalfa, timothy, native hay, corn fodder and the salt¬ 
bush agree in showing that the substances containing this group are 
broken down to the extent of about 25 per cent, of the amount pres¬ 
ent. The result obtained with sorghum was wholly unsatisfactory; 
though the determination of this group in the feces, corresponding 
to the sorghum, was made three times and in the sorghum itself 
twice, with satisfactory agreement in every case. The result, how¬ 
ever, indicates that fecal matter may yield this group or, perhaps, it 
is safer to interpret it that the substances containing this group in 
the case of sorghum are not digested at all, and that the excess of 
methoxyl in the feces is due to some error in our determination 
which we failed to detect, even though we repeated it. 
AMID NITROGEN. 
§151. The amid nitrogen found in the saltbush hay corres¬ 
ponded to 4.180 per cent of proteids, while that in the orts repre¬ 
sented only 1.556 per cent, of proteids. We failed to find any in the 
feces. As we usually interpret these results, the amid nitrogen was 
wholly digestible, or has a coefficient of 100.00 per cent. 
THE FUEL VALUE OF SALTBUSH, Atriplex argentea. 
§ 152. The total dry matter consumed by the sheep in five days 
was 15,253 grams. We found the calorific value of this dry matter 
to be 3,886 calories per gram, or a total of 59,273,158 calories. The 
dry matter in the feces was 8,200 grams, with a heat value of 4,398 
calories per gram, or a total of 36,063,600 calories. The sheep, ac¬ 
cordingly, appropriated 23,224,811 calories, or 39.16 per cent, of 
the fuel value—the lowest coefficient of all the fodders used. 
§153. The amount af urine voided in this instance was so ex- 
