THE ADRENAL OR SUPRARENAL GLANDS. 197 



scopicallv of a homogeneous transparent liquid in which are 

 suspended large numbers of minute round or oval globules 

 of fat, varying in size from two to five /A These globules 

 cause the opacity and white color of the milk ; they are sup- 

 posedly surrounded and kept intact by albuminous (casein) 

 envelopes. 



The milk secreted at the beginning of lactation, the colos- 

 trum, contains, in addition to the constituents of ordinary 

 milk, larger spherules of fat and colostrum-corpuscles. The 

 latter are large cells filled with particles of fat, and are re- 

 garded by some as epithelium-cells; by others, as wandering 

 cells which have undergone fatty degeneration. 



