The Origin of Chrysanthemum Scyctiun 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 60 63 66 69 72 75 78 8< 84 87 90 93 96 99 1 02 
1897. 
21 
1898. 
AJL 
26 
48 
7599. 
26 
7900. 
AAAAA 
12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 5 7 60 63 66 69 12 75 78 81 84 87 90 93 96 99 102 
Fig. 32. Ancestral generations of Chrysanthemum scgctum 
plenum. 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 2i-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. 
