Dctcrnii nation of Sex in Hydatina scnta 



I'ABLE I— Continued 

 Temperature 20° to 22° C. 



The nature of the sex-producing power of the daughter-females 

 of each individual mother is given separately in order to show that 

 the ratio between the daughter-females producing male and female 

 offspring varies with different mother-individuals, and also varies 

 as much in the daughter females of sister-mother-individuals. 



TABLE II 



Summary of each generation in Table I and also the final summary of all the generations taken 

 together. 



Temperature 20° to 21° C. 



