INHERITANCE IN HYDATINA 



63 



effect of this selection on viability is described later under the 

 headings Li and Hi. I merely call attention here to the difference 

 in the proportion of male-producers, 37.0 per cent in one line, 

 20.5 per cent in the other. 



{D X C) X (D X C). Females of the parthenogenetic line 

 D X C were mated with males of the same line November 26 

 to 30, 1911. From 38 such matings were secured 576 eggs. By 

 December 20, when the hatching must have been nearly com- 

 plete, 319 of these eggs, or 55.3 per cent had hatched (table 12). 

 The greater number of these eggs were hatched on a few suc- 

 cessive days, hence the standard deviation is low (o- = 1,65). 



TABLE 11 



Percentage of cf 9 



20.5 



TABLE 12 

 Showing number of eggs that hatched, out of 576 in {D X C) X (D X C), figure 1 



Percentage of viable eggs. 



55.3 



Standard deviation: o-n = 1.65 



