AGRICULTURE AND DENDROLOGY. 
35 
B. Concentrated Feeding Studs. 
Owing to the organization of their digestive organs, the 
ruminants cannot be safely fed for a period of several weeks 
with concentrated feeding stuffs only. Their ration must 
contain some coarse fodder. In experiments on the diges¬ 
tibility of the former class of feeding stuffs they must 
consequently be given in mixture with a coarse fodder of 
known digestibility. Generally in the first period the 
digestibility of the coarse fodder is determined, when fed 
alone and in the second period a certain amount of the 
concentrated fodder is added and the digestibility of the 
mixture is determined. As those kinds of the latter class of 
feeding stuffs which contain a medium proportion of crude 
protein, do not essentially alter the digestion of the former 
class, the two feeding' periods usually yield results which 
admit of calculating the digestibility of the concentrated 
fodder accurately enough for practical objects. The methods 
for keeping and feeding the animals and for collecting the 
fæces during the two periods were in our researches, of 
course, the same as in the trials on coarse fodders already 
described (p. 3—6). 
I. Rice Bran (Nuka). 
The rice bran is a refuse material obtained in the 
process of “ polishing” or “ whitening” the grains previously 
freed from the chaff. It consequently consists only of the 
