488 INTERNAL SECRETIONS 



skin and atrophic teats, and was thin and generally apathetic, 

 had implanted into it both ovaries of a pregnant four months 

 old female. Four weeks after the operation heat occurred, 

 and about two weeks later the teats grew in size. Later on the 

 hair began to grow. Subsequently 2^ months after the 



Fig. 141. — "Rejuvenation" of senile dog, i^ years old. Three months after 

 operation (unilateral resection of the epididymis). Weight 40 kgr. — 

 From Wilhelm. 



operation the animal became pregnant and gave birth to five 

 young, which she suckled. 



Steinach's experiments, in which he Hgatured the vas, have 

 been confirmed by Sand (ic2i) and Wilhelm (1922, 1923) on the 

 dog. In Sand's experiment the animal M-as more than 12 years 

 old, and in those of Wilhelm as much as 18 years old. 

 Both authors made a resectio epididymidis. There was an 

 extraordinary general improvement and recuperation of sexual 

 activity. The body weight increased greatly. The results 



