§ 3 



REACTION TO STEROID HORMONES 



androstane groups. As will appear from the next paragraph, 

 the growth- and concentration-curves of the respective mem- 

 bers also differ from each other, but to a lesser extent'. 



3 . THE REACTION TO STEROID HORMONES 



A. The reaction to estranes. 



a. Estrone. With concentrations of 20, 250 and 1500 y 

 per 750 ml water the following growth-curves were obtained 

 (Fig. 4). The characteristics of these curves are:— 



Latent period, 5^ hours. Growth ceases after 60 hours. 



b. Estradiol. With concentrations of 12^, 25, 250 and 

 500 7 per 750 ml water the following growth-curves were 

 obtained (Fig. 5). The characteristics of these curves are:— 



Latent period. 5 >^ hours. Growth ceases after 60 hours. 



6 



30 42 54 66 J8 



hours 



Fig. 4. Ovipositor growth curves 

 after administration of estrone. 



Fig. 5. Ovipositor growth curves 

 after administration of estradiol. 



c. Estriol. With concentrations of 25, 500, 1000 and 

 1500 7 per 750 ml water the following growth-curves were 

 obtained (Fig. 6). The characteristics of these curves are:— 



Latent period, 5 >^ hours. Growth ceases after 48 hours. 



d. Equilenin. With a concentration of 1250 7 per 750 ml 

 water the following growth-curve was obtained (Fig. 7). 

 The characteristics of this growth-curve are: — 



Latent period, 5^2 hours. After 30 hours the growth- 

 curve still continues. 



