The Origin of Chrysanthcinuui Scgctum Plenum. 181 



Chance may also be unfavorable in another respect. 

 It often happens that the best plant is not sufficiently 

 vigorous to be chosen as seed-parent, but fortunately this 



12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 CO 63 66 69 72 75 78 81 84 87 90 93 96 99 102 



1897. 



1898. 



.AA. 



.yzx 



1899. 



-.a. 



J::. 



26 



66 



1900. 



ntMx 



M 



12 15 18 21 24 27 30 33 36 39 42 45 48 61 54 5^ 60 63 66 69 72 75 78 81 84 87 90 93 96 99 l02 



Fig. 32. Ancestral generations of Chrysantlicmum scgctum 

 plcuimi. Curves of the number of rays in the terminal 

 inflorescences in the several individuals of the genera- 

 tions of 1897- 1900. For the numbers themselves see 

 page 180. The seed-parent of 1896 was 21-rayed (X at 

 the top of the 1897 curve) ; the other chosen seed-parents 

 are indicated in the various curves by a X over the appro- 

 priate ordinate. The original plant, from which the 

 culture was derived, was the individual grown in 1895 

 as No. I (p. 175) from which No. ic arose in 1896, and 

 from the seeds of this came the culture of 1897. 



difficulty did not present itself in the experiment under 

 consideration, partly because of the favorable conditions 

 of culture. 



