Equilibrium Between Selection and Nutrition. 565 



8 10 n u 16 18 no 



Fig. Ii8. Chrysanthemum 

 segetum. Curves of the ray- 

 florets of the terminal in- 

 florescences. Under the ab- 

 scissa are the numbers of 

 these florets. The number 

 of ordinates is reduced to 

 the half; 8 therefore means 

 7-8 ray florets etc. (height : 

 I mm=i%). 



A (97 plants) Dimorphic 

 curve from a mixed sowing 

 1892. 



B (i62plants) Bythe selec- 

 tion of plants belonging to 

 the group with 13-14 florets 

 as seed-parents the curve 

 has become monomorphic 

 in the next generation, 1893. 

 — The curve for 1894 was 

 almost exactly the same as 

 that for 1893. 



10 11 12 



Fig. 119. A, Coriandrum sativum 

 (334 plants). Curve of 1894. The 

 numbers under the abscissa refer to 

 the number of rays of the primary 

 umbel. Height of the ordinates : I 

 mm=i% of the individuals. 



B, Bidens grandiiiora (152 plants). 

 Curve of 1894. The numbers under 

 the abscissa signify, in curves B and 

 C, the numbers of ray-florets in the 

 primary inflorescences. Height as 

 in A. 



C, Coreopsis tinctoria (495 plants). 

 Curve of 1893. 



