112 PRINCIPLES OP VETERINARY SCIENCE 



extract becomes less and less effective as time goes on. Injec- 

 tions 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. The pineal body is regarded as a 

 dorsal eye of a remote ancestor. Disease of these bodies during 

 early life prevents development of the genital organs and results 

 in abnormalities in the shape of the bones. Their removal is 

 fatal after a short interval. 



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