PARTHENOGENETIC PURE LINE OF APHIS AVEN/E FAB. 



TABLE VI. 



GIVING LENGTH MEASUREMENTS OF INDIVIDUALS IN ISOLATION 9, THEIR AVERAGE 

 CORNICLE LENGTH, THE LENGTH OF THE CORNICLES IN PERCENTAGE 

 TERMS OF BODY LENGTH, AND THE COMPUTED PERCENTAGES REP- 

 RESENTING THE FRATERNAL MEAN. 



work than that of stature, or body length. It was this character 

 that was used by Gal ton when he formulated his law of regression, 

 and it is a character that is well known to be inherited under the 

 influence of amphimixis. Furthermore, body length is a char- 

 acter the variation of which can be easily measured, and by 

 past experience had proved to be a suitable one to work with for 

 various reasons; hence this one was decided upon. 



In isolation n selections were made only from among wingless 

 agamic females, in fact after a few generations had been obtained 



I learned that by controlling somewhat the temperature only 

 such forms appeared. When selections were started in isolation 



I 1 it had been planned to continue them for a hundred genera- 

 tions; and, if by the time the twentieth generation had been 

 obtained no effect of selection had appeared, to change the con- 

 ditions of the experiment for each subsequent score of generations 



