VARIATION OF FAT IN MILK. 



69 



conditions the cows are milked in the morning about 5 o'clock, 

 and in the evening about 7 o'clock. This is especially true 

 during the spring and early summer months. This long interval 

 during the day causes the cow to give a greater quantity of 

 milk in the evening, but it contains a smaller per cent of fat. 

 The recent results obtained by Ingle illustrate this point very 

 plainly. Five cows were milked at 6 a.m. and at 3 p.m. during 



Fig. 15. — The wrong way to milk cows. (From Glucose Sugar Refining 



Catalogue.) 



a period of three weeks. The average fat-content of the eve- 

 ning's milk was 4.26% and of the morning's milk 2.87%. 

 During the four weeks following the same cows were milked 

 at 5.30 .\.]\i. and 5 p.-m. The fat-content of the evening's milk 

 was 3.80%, and of the morning's milk 3.18^^;. It is main- 

 tained, and the above results indicate the same, that even 



