THE TYPES 



201 



strated, microscopically, by comparing the appearance of 

 the active cells in the secreting udder with those that are 

 inactive, in the dry cow or the virgin heifer (Fig. 995). 





B 



FIG. 99 B. Alveoli of the mammary gland of goat at the time of 

 parturition, showing successive stages of secretion, a, epithelium at 

 rest ; 6, alveolar content consisting of cells ; c, smooth muscle cell ; 

 d, connective tissue; e, alveolar content consisting of coagulated 

 casein and free fat ; /, fat droplets in the epithelial cells ; g, blood 

 capillaries. (After Martin.) 



223. D airy typ e (Figs . 1 00 and 101). Since the produc- 

 tion of milk and beef are not correlated, the dairy form is 

 characterized by an extreme absence of all that pertains to 

 beefiness. The form in general is triangular instead of rec- 



