74 



A. FRANKLIN SHULL 



Effect of selection for high and low viability in the low viability 

 series {repeatedly inbred) 



Li. Females from the parthenogenetic line L3, whose parent 

 was selected at random without reference to viability, were mated 

 with males of the same hne May 19 to 23, 1912. From 38 such 

 females were obtained 241 eggs, of which 53, or 21.9 per cent, 

 hatched before June 7 (table 29). 



Twelve of the above 38 females were kept isolated and the 

 hatching of their eggs recorded separately. In the least viable 

 family, 1 egg in 12, or 8.3 per cent, hatched; in the most viable, 

 4 out of 11, or 36.3 per cent, hatched. From the first* daughter 

 in each family a parthenogenetic line was reared (table 30) . The 

 low viability line included 37.5 per cent of male-producers, the 

 high viabihty line 13.6 per cent. 



L from L. Females of the parthenogenetic line in L4 bred from 

 a low viability family were mated with males of the same line 

 June 11 to 13, 1912. From 26 such females 223 eggs were ob- 

 tained, of which 74, or 33.1 per cent, hatched prior to July 14 

 (table 31). 



H from L. Females of the high viability line (selected for 

 high viability from low viability eggs) in L4 were mated with 

 males of the same line June 15 and 16, 1912. From 12 such 

 females 74 eggs were obtained, of which 24, or 32.4 per cent, 

 hatched prior to July 14 (table 32). 



TABLE 29 

 Showing number of fertilized eggs that hatched, out of 241 in lot Li, figure 1 



Percentage of viable eggs. 



21.9 



