New York AGRICULTURAL EXPERIMENT STATION. 15 
_ The relative changes in the yield of milk and its several con- 
stituents may perhaps more clearly appear by taking the amount 
of each during the first period as 100, and the following table 
ae ‘so represents the data secured during the experiment : 
F Pounds milk Total : ; ; 
‘ PERIOD. | Nini’ | | forone. [solids in | 7inticg | “nnitke. (in milk 
| a 100. 100. | 100. | 100. | 100. | 100. 
eas 92.8 84.4 | 108.1 | 106.1] 96.3 | 98.7 
Ge aD 91.7 78.4| 105.1 107.8| 93.9| 98.3 
Bre es, 85 .0 77.9 | 107.9 | 112.7 | 90.7 | 100.4 
i eos. 74.4 73.9 | 108.5 | 118.8 | 87.0 | 101.3 
aaa 72.7 73.4 | 110.5 | 114.1 | 84.9 | 102.6 
es 72.1 70.6 | 110.5 | 118.0 | 84.6 | 106.1 
Meee... 73.3 68.6 | 110.9 | 111.0 | -89.1 | 100.4 
a 
The accompanying diagram graphically illustrates the changes 
in composition during the several periods, the yield of milk, the 
total solids, the amounts of fat, casein and sugar in milk and the 
- number of pounds of milk required for a pound of butter during 
the first period being in each case taken as 100. 
It will be seen at a glance that there is a rather steady decrease 
_ in the milk yield, and even more steady, though not so great, 
increase in the total solids; also, that the increase in fats closely 
corresponds to the decrease in sugar, while the casein varies but 
little in quantity during the eight periods. 
The amount of milk required for a pound of butter diminishes 
far more rapidly during the first two periods than does the milk 
yield, and more rapidly than the fat increases during the same 
periods, but during the later periods the amount of milk required 
to make a pound of butter varies quite regularly with the increase 
___ of fats in the milk, showing that the creaming of the milk and 
| churning qualities of the cream were quite uniform during the 
entire experiment, notwithstanding the frequent changes in food. 
det REGULARITY OF MILK SECRETION. 
BY ' For five days (April nineteenth to twenty-third, inclusive) Flora 
-  -was milked regularly at alternate intervals of fourteen and ten 
hours, the longer interval being from night to morning; during 
