Fre, 3.—Involution of the udder of an old cow. (A) epithelium, (B) leucocytes, (C) 
blood capillary, (D) interalveolar connective tissue. (From Chemie und Physiologie der 
Milch, by Dr. W. Grimmer.) 
A B 
Fie. 4.—(A) Funnel-shaped, (B) bell-shaped extremity of the milk cistern. (From Chemie 
und Physiologic der Milch, by Dr. W. Grimmer.) 
