Duchess (A+cotton-seed oil) : Increase in milk, .24 lbs. ; decrease in fat, 

 .30 per cent. 



Princess Leto (A+cocoanut oil): Decrease in milk, .91 lbs.; increase in 

 fat, .15 per cent. 



The return, in period five, to their regular ration was followed 

 by a sharp increase in milk and a decrease in fat. 



Duchess : Increase in milk, 2.90 lbs. ; decrease in fat, .04 per cent. 

 Princess Leto : Increase in milk, 1.88 lbs. ; decrease in fat, .45 per cent. 



In period six, the cows were at pasture and both shrank in 

 milk. Duchess increased in fat, while Princess Leto remained 

 practically constant. 



Duchess: Decrease in milk, 2.10 lbs.; increase in fat, .51 per cent. 

 Princess Leto : Decrease in milk, 1.74 lbs.; increase in fat, .01 per cent. 



It would seem that the first effects of feeding oils was to 

 increase the fat in the milk. Princess, in period one, averaged 

 5.18 per cent. ; with the addition of corn oil her average for 

 ten days was raised to 5.48 per cent., an increase of three 

 tenths of one per cent. Omitting the oil, her average for the 

 next five days fell to 5.24 per cent. Had similar results been 

 reached with the other cows, as probably would have been the 

 case had they all returned to ration A, and the experiment 

 stopped at this point, it might have been said that it had been 

 proven that adding fat to the ration increased the fat in the milk. 

 But we notice that the sharp increase in fat was followed by a 

 decrease, until the milk again nearly reached its normal condi- 

 tion. In period two, with palm oil. Duchess gave milk with 

 4.52 per cent, of fat; in period four, with cotton-seed oil, it 

 fell to 4. II per cent. We cannot say that this change was due 

 to the change in oils, for in period two, Maramee, with cotton- 

 seed oil, increased the fat in her milk from 3.22 to 3.47 per 

 cent. 



The addition of these oils to the cows' rations produced no 

 objectionable qualities in the butter product. With respect to 

 hardness, there are two variations that should be noticed: i. 

 The softening of the butter from Princess Leto when upon 

 corn oil. The change was noticeable, not alone in the butter, 



