FEMALE BITTERLING 



I 



c. Allo-pregnanol, ^-one-20. With concentrations of 

 15, 40, 50, 80 and 100 y per 750 ml water the following 

 growth-curves were obtained (Fig. 10). The characteristics 

 of these curves are:— 



Latent period, i hour. Linear growth ends after 5 hours. 



AU 



7\- 



6 



5 



4 



3 



2 



hours 



Fig. II. Ovipositor growth curves after administration of 

 allo-pregnanediol, 3-20. 



2 4 6 2 4 6 



hojrs 



Fig. 12. Ovipositor growth curves after administration of 

 A 5,6 pregnenedione, 3-20. 



