ANIMAL MATTER IN MILK 



33 



milk channels. They are cut across. The walls 

 appear as white fibers. On the inside edge of 

 the walls are numerous round balls, some white 



Courtesy M. P. Ravenel. 

 SECTION ACROSS COW'S UDDER 



and some black. These are the cells forming 

 the velvet lining of the milk tubes. The white 

 ones contain butter fat, and the black ones are 



