88 



Plant-Breeding 



During this time the means of the different generations 

 were gradually increasing. So far there was observed a 



12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90 93 96 99102 



1897. 



1898. 



AJL 



4?- 



1900. 



AAAAA 



12 15 18 21 24 27 30 33 36 39 42 4S 48 SI 54 5? 60 63 66 69 72 75 78 81 84 87 90 93 96 99 102 



FIG. 28. Ancestral generations of Chrysanthemum segetum plenum. 

 Curves of the number of rays in the terminal inflorescence in the 

 several individuals of the generations of 18971900. 



rapid increase in number of petals, but no indication of 

 doubling. 



But this character soon appeared; three secondary 

 heads on one plant in the fall of 1899 showed a few ray- 



