DAIRY FARMING DAIRYING. 



339 



"The results are remarkably uiiifonii and illustrate emphatically the 

 correctness of the Babcock method of enumeration of fat globules in 

 cows' milk." 



The microscopic examinations of tlie milk of the university herd were 

 commenced in 1888 (E. S. E., 2, p. 454:), and were continued to the 

 spring- of 1894, when they were suddenly terminated by tuberculosis in 

 the herd, which necessitated killing all but 2 of the cows. The main 

 object was to study the influence of advancing age on the size and 

 number of the fat globules. The data for the individual cows are tab- 

 ulated in detail and are summarized for the beginning and end of lac- 

 tation for different breeds and for different ages. The data for the 

 beginning and end of the period of lactation are summarized below. 



Fat {/lobules in cowh' milk at beginning and end of period of lactation. 



"The average nuraber of globules per 0.0001 cmm. for all cows is, at the begin- 

 niug of the lactation period, 138, and at its end 367; the average relative size of the 

 globules is 318 and 149 for the beginning and the end of the lactation period, 

 respectively; the latter figures correspond to a diameter of the average sized 

 globules of 0.00419 and 0.00316 mm., respectively." 



The milk of cows was examined for fat globules at the beginning of 

 4 consecutive periods of lactation, that of 12 cows at the beginning of 3 

 periods, and that of IG cows at the beginning of 2 periods. At the end 

 of the lactation period the milk of 2 cows was examined for 3 years and 

 Oif 11 cows for 2 years. 



" [The results as tabulated] fail to disclose any striking ditferonco as to the influ- 

 ence of advancing age on the fat globules in milk. The tendency seems to be toward 

 fewer globules and a somewhat larger size with increasing ago at the beginning 

 of the i)eriod of lactation, and at its end the opposite seems to hold true. The dill'er- 

 ences found are, however, not very marked." 



