SECRETION OF MILK 7 



indicate the quantity of blood carried from the 

 gland. If there happens to be pressure on the an- 

 terior veins, the blood may return to the heart by 

 way of the posterior veins. The veins which run 

 forward are often very torturous and may branch 

 several times. They enter the chest wall through 



MARY MARSHALL, A GUERNSEY WINNER AT THE PAN- AMERICAN 



EXPOSITION ; HAS LARGE, TORTUOUS MILK VEINS AND 



EXCELLENT DAIRY CONFORMATION 



openings, termed milk wells, which are sometimes 

 large enough to insert the end of the finger. Large 

 tortuous veins are considered an indication of abil- 

 ity to secrete large amounts of milk. However, if 

 the hole in the abdominal wall is small these large 

 veins may be the result of congestion of the blood 

 at that point. 

 Theory of milk secretion. The work of the mam- 



