84 The: Colorado Explrime:nt Station. 
§197. The similarity between the alfalfa and the saltbush in 
regard to the amount of proteids present and their solubility in these 
solvents is striking, and two things regarding them is very evident, 
i. e., while one-half of the proteids were removed from the alfalfa 
by the i per cent, sodic hydrate, only one-third of them was removed 
from the saltbush, but the amount removed by chlorin and subse¬ 
quent washing with i per cent, sodic hydrate and hydric sulfite is 
five times as great. The relative quantities, owing to the fact that 
the quantities fed were so nearly alike, are the same, i. e., one-for¬ 
tieth and one-eighth respectively. The nitrogenous substances re¬ 
moved by the chlorin and the subsequent washings usually amount 
to but a few grams and are apparently often more abundant in the 
feces than in the hay or fodder, but in the saltbush hay such pro¬ 
teids (?) are unusually abundant and they have a coefficient of di¬ 
gestion, according to our experiments, of about 29 per cent., which 
is, of course, very low. We evidently have to do with nitrogenous 
substances quite different in character and while our division of 
them into groups is not satisfactory, we still have three big groupS; 
those removed by 80 per cent alcohol, always with a good or even 
high coefficient of digestion; those soluble in hydric chlorid dif¬ 
fering very much in their digestibility, from 39 to 63 per cent, in 
the different fodders, and those soluble in sodic hydrate which have 
high coefficients of digestion, except in the case of the corn fodder 
in which this group of nitrogenous substances is not nearly so large 
as in the other fodders and is, apparently, so good as indigestible. 
The proteids soluble in cold and hot water are not considerable in 
quantity, except in the alfalfa and saltbush, and are not very digesti¬ 
ble, while those removed by chlorin, etc., are small in quantity, ex¬ 
cept in the case of the saltbush, in which they constitute an eighth 
of the total, and either show a low coefficient of digestion, 29 per 
cent, in the case of the saltbush, or are more abundant in the feces 
than in the fodder fed. 
§198. What the bearing of these facts may be on the feeding 
values or properties of the fodders is not clear. 
§199. It may be well to consider some facts, as well as we 
may, but without assuming that we know anything about them. 
The alfalfa and saltbush, for instance, constitute the extremes in 
our series of fodders, perhaps I should, to be logical in interpre¬ 
ting our results, class sorghum and saltbush together. As already 
stated, I cannot but entertain a strong opinion that the sorghum 
should be studied further, because of the very unfavorable results 
obtained. It must, however, be acknowledged that the results in 
the case of the three sheep were uniform and unfavorable, though 
the fodder was apparently of. excellent quality and in very good con¬ 
dition. The results showed a loss of almost three pounds in each of 
