564 Curves of Coinpositae and Umbelliferae. 



In 1893 the seeds of these 15 plants were sown on 

 8 square meters of ground; 162 plants were raised. All 

 of these were weeded out, with the exception of 12 

 plants whose terminal heads had 11-12 ray florets. That 

 is to say, the seed-parents exhibited an advance in the 

 negative direction as compared with the previous year. 



CHRYSANTHEMUM SEGETUM. 



The curve of 1892 was therefore dimorphic ; those of 1893 and 

 1894 monomorphic. From the two latter the following data have 

 been calculated. 



In the third year, 1894, the culture occupied 6 square 

 meters : it was raised from the seed of three plants of 

 1893, each of which had 12 rays in the terminal head, 

 and only 13 in the later ones. The number of plants at 

 the time of selection was 338. 



