GONADOTROPIC SUBSTANCES 



least, it is invariably present in the urine and blood of preg- 

 nant women, especially in the first half of pregnancy. As a 

 commercial source of the hormone, the urine of pregnant 

 women is still the best. According to Aschheim (1930), prolan 



TABLE VI 



Gonadotropic Hormones from Tissues Other Than the Anterior 

 Pituitary and from Body-Fluids and Secretions 



may be detected in the urine as early as the sixteenth day 

 following fertile coitus. Large amounts of hormone are ex- 

 creted in the urine during the first few months of pregnancy 

 (Aschheim and Zondek, 1927-28). It is generally agreed that 

 much less prolan, determined by assay in the rabbit and the 



[177] 



