197 
1914-15.] Influence of Feeding on Composition of Milk. 
differences in the amount when one cow was compared with another. 
The percentage of fat, as is usually the case, showed more variation 
(Table III). 
Lot I was kept on the same ration during the whole period of the 
experiment. On 15th January the feeding of calcium phosphate to the 
cows in Lot II was commenced, the quantities added to the ration of each 
cow being as follows : — 
For the first 3 days: 2 oz. per day. 
„ „ next 4 „ 4 „ „ 
j j 5 j 7 ,, b ,, ,, ,, 
21 8 
The addition of calcium phosphate was then stopped and the 
original ration continued for other two weeks. 
An examination of the percentages of phosphoric acid found shows 
that the addition of calcium phosphate has not increased the amount of 
phosphoric acid in the milk. There is practically no change, and the 
results vary less than those obtained from Lot I, where the cows were 
on the same ration all the time. Since the cows were receiving calcium 
phosphate over a period of five weeks, Neumann’s criticism that the 
negative result is due to the experiment not being continued sufficiently 
long is inapplicable in this case. The increase in the amount of phos- 
phoric acid (•0172) which he claims to have effected appears to be well 
within the ordinary limits of variation. 
In the same way an examination of the percentages of fat, ash, and 
“solids not fat” obtained (Tables II, III, and IV) does not indicate that 
the extra calcium phosphate fed to Lot II has had any effect on the 
amount of these substances secreted. Finally, no definite effect on the 
yield can be observed. 
The investigation was carried out at Bangour Village Farm, and we 
have to express our indebtedness to the Edinburgh District Board of 
Control for providing the facilities for the work. 
[Table I 
