54 The Coeorado Experiment Station. 
tion dissolves only about one-half of the nitrogen contained in the 
alfalfa, the other half being contained in the alcoholic extract (7-19) 
and in the hydric chlorid extract (i-io). The relative amounts of 
heat appropriated by the animals from these two extracts is remark¬ 
ably different, 80.9 per cent, of that from the alfalfa being appro¬ 
priated, while only 35.17 per cent, of that from the corn stalks. In 
the alfalfa the three portions, i. c., extracts obtained by treatment 
with alcohol, and sodic hydrate and the residue, or that portion 
which we have called cellulose, yield five-sixths of the available 
heat; in the corn fodder it is the extracts removed by alcohol, hydric 
chlorid and the residue or cellulose that furnish almost six-sevenths 
of the total heat. 
§130. These two fodders agree in showing that the alcoholic 
extract and the cellulose are two important factors in a fodder; 
they differ in regard to the third factor, one indicating that the por¬ 
tion soluble in sodic hydrate and the other that that soluble in 
hydric chlorid, is the third in importance. This is probably the 
big difference between the two, though both are capable of furnish¬ 
ing more energy than is necessary to simply maintain the animal 
and contain no constituent whose physiological action is detri¬ 
mental. 
§131. There are many hints that the results are modified to 
a considerable extent by the fecal matter proper, but it is not sep¬ 
arable from the undigested residue of the fodder. 
§132. The difference between the sodic hydrate extracts in 
these two cases is great, not only in the quantity of heat represented, 
but also in the availability of the heat value of the substances taken 
into solution. The sheep consumed, in round numbers, ten millions 
heat units with the alfalfa which had proven insoluble in the alcohol, 
water and hydric chlorid, of which 80.92 per cent, were available, 
while the others consumed but six millions from the corn fodder, of 
which only 35.17 per cent, were available, making an actual differ¬ 
ence of over six millions of heat units obtained from this portion of 
these fodders. These quantities are those actually consumed and 
appropriated by the sheep and not comparisons based on like weights 
of the fodders. Such a comparison would result in a more favor¬ 
able showing for the corn fodder. 
§133. The distribution of the nitrogenous substances in the 
various extracts of alfalfa hay have been given in a previous table 
and also that for the corn fodder. The big feature in the case of the 
alfalfa is that nearly 50 per cent, of the total digestible nitrogenous 
substances is insoluble in alcohol water and hydric chlorid but solu¬ 
ble in sodic hydrate and, further, that 80.89 cent, of the total, 
soluble in sodic hydrate, is digestible. This ratio holds, too, for 
native hay, but the coefficient of digestion for the nitrogenous mat- 
