INHERITANCE IN HYDATINA 



73 



Hi X Lo. Females of the parthenogenetic line H2 were mated 

 with males of the line L2 April 7 to 15, 1912. From 30 such 

 females, 294 eggs were obtained. Of these, 203, or 69.0 per 

 cent, hatched before May 6 (table 28). 



These reciprocal crosses bear precisely the same relation to 

 each other and to their parents as do the reciprocal crosses C X D 

 and D X C. The reciprocals are unequal, that one having the 

 higher viability whose mother belonged to the high viability 

 line. In both cases, the cross whose mother came from the high 

 viabihty line (C X D and Ho X Lo) possessed greater viability 

 than either parent line. 



TABLE 27 



Showing number of fertilized eggs that hatched, out of 4^7 in lot L2 X H^jin figure I 



Percentage of viable eggs. 



57.3 



TABLE 28 

 Showing number of fertilized eggs that hatched, out of 294 in lot Ho X L2, in figure 1 



Percentage of viable eggs. 



69.0 



