BEEED DIFFERENCE IN MILK. 95 



in a short time ; and on account of the evenness of their size 

 and their being so few granules, a smaller proportion of them 

 are left in the skimmed milk, and it therefore shows a blue 

 appearance. 



Ayrshire milk,. with reference to the globule, can be 

 separated into two divisions. The Ayrshire breed has been 

 tried for many years with reference to making cheese and 

 with reference to making butter, and for both purposes. 

 One breed is a butter cow ; she gives a very favorable butter 

 product. One breed is a cheese cow ; the per cent, of cream 

 is much less. Therefore if you select the milk from a cow 

 belonging to what I may call the butter branch of the Ayr- 

 shire family, the globule is larger than in the milk of that 

 branch of the tribe which has been bred with reference to 

 cheese. But it differs from Jersey milk in containing many 

 granules, many small globules, and very few globules as large 

 as those contained in Jersey milk. In fact, there is a marked 

 difference between the two in the size of the globules, and 

 being smaller, the result is, that the cream rises to the surface 

 less swiftl}', and separates from the skimmed milk less com- 

 pletely, leaving a white-colored skimmed milk. 



The globules of the milk of the Dutch breed are much 

 smaller than the globules of Ayrshire milk ; about as much 

 smaller than the Ayrshire globule as the Ayrshire globule is 

 smaller than the Jersey. In fact, the Ayrshire globule occu- 

 pies an intermediate position between the Dutch and Jersey 

 breeds. The Dutch gloliule is more uniform in size than the 

 Ayrshire, and although there are many granules in it, yet 

 there are not so many in it as in the Ayrshire milk. Accord- 

 ingly, the skimmed milk jDresents a very blue appearance. 



Question. Does Dr. Sturtevant wish it understood that 

 the globules in any one of these three cases are to be regarded 

 as reincorporated with the milk again, as they were originally, 

 or only mixed with the milk? 



Dr. Sturtevaxt. It is always mixed, never incorporated, 

 in the sense of being a different product ; but whether they 

 are mixed as completely as in the natural product, I cannot 

 tell. But the eye will detect no difference in those cases 

 where I call them mixed. 



Now, there are other relations between these globules and 



