FEMALE BITTERLING 



6 



30 42 54 65 76 

 hour 



24 ^ 30 

 hours 



Fig. 6. Ovipositor growth curves Fig. 7. Ovipositor growth curves 

 after administration of estriol. after administration of equilenin. 



B. The reaction to pregnanes. 



a. Progesterone (4,^-pregnenedione, 3-20). With con- 

 centrations of 4, 6, 7>4, 10, 15, 20, 25 and 30 7 per 750 ml 

 water the following growth-curves were obtained (Fig. 8). 

 The characteristics of these curves are:— 



Ovipositor growth curves after administration of 

 4,5-pregnenedione, 3-20. 



