The Influence of Extraneous Factors 69 



The bulk of the androgenic material appears to occur in a bound 

 form and can be set free by hydrolysis with hydrochloric acid. 



c I c 



QIX 13C \ 



18CH3 1 I leC 



C C 14C / 



/^\ /.\ / \ia/ 



Q2 QIO 8C C 



III 

 C3 5C 7C 



c c 



The tetracyclic carbon skeleton 

 in androgens 



OH 



I 



I 

 O 



) 



Testosterone 

 (A4-androsten-17-ol-3-one) 



O 



HO 



Dehydrowoandrosterone 

 (A5-androstan-3(i3)-ol-17-one) 



Sperm-egg interacting substances and chemotaxis 



The so-called sperm-egg interacting substances comprise a group 

 of agents which have received considerable attention from pioneers 

 in the field of sex physiology such as Lillie (1919) and Loeb (1913), 



