SCIENCE AND PRACTICE OF DAIRYING. 



partition, running longitudinally. Each of the halves contains a 

 large milk-gland of a reddish-gray colour, or more correctly speak- 

 ing, an accumulation of glandu- 

 lar structures, called the gland- 

 basket. In the case of adult 

 milk-cows, each milk-gland is 

 from 24 to 52 centimetres (9J 

 to 20 inches) in length, 16 to 

 31 centimetres (6J to 12 J inches) 

 in depth, and 10 to 21 centimetres 



Fig. 4. Gland-lobules, e, Outlet tube, 

 (x 60.) (Fiirstenberg.) 



Fig. 5. Alveoli, d, Common duct, (x 200.) 

 (Kurstenberg.) 



(4 to 8 inches) in breadth. They contain, embedded in a white con- 

 nective tissue (fig. 3), the delicate gland-lobules (fig. 4), in which occur 



Fig. 6. Cylindrical Epithelial Cells, a, Cells grouped together; b, process of basement 

 membrane ;/, free cylindrical cells, (x 600.) (Ftirstenberg.) 



numerous round cavities, the microscopic gland-lobules or alveoli 

 (fig. 5), which are terminal or lateral dilations of numerous and 

 extremely fine canals. When the cow is in milk the alveoli have a 



