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TRANSACTIONS OF SECTION M. 



The cows received the following ration : — 



75 lb. turnips. 

 4 ,, Bombay cotton cake. 

 1 ,, bran. 

 8 „ hay. 

 straw (ad lib.). 



The mineral matter in this ration, exclusive of the straw, contained about 

 "5 lb. of calcium phosphate. 



The analyses made during the preliminary period showed that the percentage 

 of phosphoric acid and mineral matter in the milk of each cow was relatively 

 constant, although there were slight differences in the amount when one cow 

 was compared with another. The percentage of fat, as is usually the case, 

 showed more variation. 



Lot I. was kept on the same ration during the whole period of the experi- 

 ment. To the other lot calcium phosphate was fed im gradually increasing 

 quantity — two, four, six, and finally eight ounces per head per day, the latter 

 amount being fed for three weeks. 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 phosphoric 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 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. 



Percentage of Phosphoric Acid in the Milk. 

 Lot I. (No Phosphate.) 



