72 Selection Does Not Lead to Origin of Species. 



fan corresponds to the mean (the apex of the curve), 

 the two dotted Hnes to the quartiles Q and Qi ; between 

 which therefore He that half of all the individuals coming 

 nearest to the average. The two outer lines of each fan 

 denote the ears with the greatest and smallest observed 

 number of rows; their divergence is of course largely 



m^ 









m'^:-- 



Fig. 17. Zca Mays. Ears with 8, 16 and 22 rows of 

 seeds from my experiment in selection carried out 

 from 1 886- 1 894. 



dependent on the size of the harvest ; this amounted on 

 the average to about 200 ears a year. 



Of the two lines going from top to bottom the right- 

 hand one represents the numbers of rows on the ears 

 actually chosen for sowing. That is to say there were 

 sown seeds from ears with 16 (1887), 20, 20, 24, 22, 

 22, and 22 rows ; ears with a greater number of rows 



