270 REPORT OF THE CHEMIST OF THE 
while in the other it is soft and oily. It is true this differsneadt is 
probably not wholly due to difference in the oil of the foods, but 
I believe much of the difference may be attributed to this. Ido 
not mean to be understood as saying that difference in food will 
make a good butter cow from an inferior animal, but rather that 
improper food fed to a good cow will result in an inferior quality 
of butter. : | 
FEEDING EXPERIMENTS. 
JEM AND MEG. 
During the winter of 1887-8 two cows, Jem and Meg, were fed 
in the experimental barn from December 20 to February 10, the 
hay fed being from the same general lot of orchard grass hay in 
good condition; the first period being hay alone; the second 
period hay and eight pounds of corn meal; the third period hay, 
two pounds of corn meal and five pounds of linseed meal, andthe 
fourth period hay, two pounds corn meal and eight pounds wheat 
bran. The animals, were weighed each morning before receiving 
food or drink. Their feed and water were weighed out to them 
and all refuse weighed back on the following morning. A record 
of the milk yield was kept, and analyses of the milk from each 
cow made so far as our laboratory force would permit. The 
milk.of the two cows was mixed and creamed by the Cooley 
process for butter, and the salted and weighed butter was care- 
fully sampled and analyzed so that the round of data has been 
quite complete. 
Digestion experiments during the first and second periods were 
carried out for determining the digestibility of orchard grass hay 
and of corn meal, or of a ration of corn meal and orchard grass 
hay. 
The cow Jem was seven and a half years old and dropped her 
last calf February 1, 1887, and was due in calf again in March. 
Meg, nine years old, dropped her last calf June 25, 1887, and was 
going farrow at time of experiment. 
The large mass of data as tabular matter makes it seem best to 
give first the tables, and to reserve all discussion of results for 
the appropriate place further along. 

