»» THE HORSE IN HEALTH AND DISEASE 



ference with the circulation. A substance known as adrenahn has 

 been extracted from the glands. It exorts a powerful action on the 

 small blood-vessels, contracting them to a marked degree and 

 causing an enormous rise in the blood-pressure. 



The pituitary and pineal bodies lie at the base of the brain. 

 The administration of pituitary extract to lactating animals 

 greatly increases the quantity of milk secreted and also its fat con- 

 tent. The increase is temporary, as the extract becomes less and 

 less effective as time goes on. Injections of pituitary extract are 

 said to correct uterine inertia at parturition, to shorten the period 

 of labor, and to prevent collapse by stimulating the heart. 



