152 Controversial Questions. 



flower on every plant in the population obtained. There 

 were 338 plants. Both series of numbers are transmuted 

 into percentages to make their comparison simpler. Here 

 is the result : 



/\. 



€ 7 a 3 10 Tt 13 13 n IS ts n w 19 »fli zi 



Fig. 2>^. Curves of large and 

 small amplitude. A, curve 

 of the variability of the 

 number of ray-florets of 

 ClivysantJiemmn segetum 

 growing wild. B, the same 

 curve describing a crop ob- 

 tained in 1894 by sowing the 

 seeds of a 13-rayed plant. 

 The numbers at the feet of 

 the ordinates correspond to 

 the number of ray-florets in 

 the inflorescence. 



In Fig. 32 these two series of figures are exhibited 

 graphically as curves. It will be seen at once that the 

 dotted curve which describes the result of the culture in 

 1894 has a much higher apex and is much steepe^r than 

 the other; that is, it has a much smaller amplitude. In 

 other words, the deviations from the mean in plants 

 growing in the field are greater in size and number than 

 they are among the children of a single plant, even when 

 this plant bore exactly the mean character of the type. 



It is clear that a generation corresponding to curve 



