100 EXPERIMENT STATION. [Jan. 



future time. The most important results only are now men- 

 tioned : — 



1. Soy bean meal, after the extraction of oil, had no effect 

 in changing the relative proportions of the several milk ingre- 

 dients, did not noticeably modify the chemical composition of 

 the butter fat, and exerted no marked influence on the body of 

 the butter. 



2. Soy bean oil temporarily increased the percentage of fat 

 in the milk, modified the composition of the butter fat by de- 

 creasing the saponification number, the percentage of soluble 

 fatty acids and the percentage of volatile fatty acids ; it in- 

 creased the iodine number from 32 to 40, and hence the olein 

 percentage, but did not change the melting point of the fat. 

 The oil likewise produced a softer, more yielding butter, that 

 would not stand up well at 70° F. and above. 



12. Work ix Progress. 

 Studies in Milk Secretion. 



Two grade Holstein cows are being fed a continuous hay 

 diet during an entire lactation period ; two similar cows a hay 

 and moderate grain diet during an entire period of lactation ; 

 two Jersey cows — a high grade and a pure bred — are also 

 receiving a hay and moderate grain diet during a period of 

 lactation. 



The objects sought are : (a) the variations in the chemical 

 composition of the milk and milk fat; (b) the milk fat con- 

 stants ; (c) the comparative composition of the milk fat from 

 Holstein and Jersey cows under similar conditions of feed and 

 care. It is also intended to observe, so far as possible, the gen- 

 eral character of the butter resulting from the hay and from the 

 hay and grain diet. This work will continue until the autumn 

 of 1907. 



Studies in Soil Anal;/ sis. 



Samples of soils from Field A, which is divided into eleven 

 different plots, and which has been under continuous treatment 

 since 1889, are being submitted to a careful examination, to 

 ascertain the chemical variations in the soil resulting from dif- 

 ferent methods of fertilization. The results thus far secured 



