§ 3 



REACTION TO STEROID HORMONES 



13 



d, Allo-ptegnanediol, 3-20. With concentrations of 

 100, 200. 300, 500 and 1000 y per 750 ml water the fol- 

 lowing growth-curves were obtained (Fig. 11). The charac- 

 teristics of these curves are:— 



Latent period, 2 hours. Linear growth ends after 8 hours. 



e. A 5'6 pregnenedtone, 3-20. With concentrations of 

 10, 20, 30, 40, 80 and 150 y per 750 ml water the follow- 

 ing growth-curves were obtained (Fig. 12). The character- 

 istics of these curves are:— 



hours 



Fig. 13. Ovipositor growth curves after administration of 

 A 5,6 pregnenol-3-one-20. 



6 



hours 



Fig. 14. Ovipositor growth curves after administration of 

 pregnanedione, 3-20. 



