The Oriyin of Chrysanthemum Scyctmn I'lcmun. 183 
in this year was offered by a plant with 48 rays which 
\vas healthy enough to be chosen as a seed-parent. But 
this figure lies very close to the next figure in the series 
(13 + 34: =47). The maximum at 21 has disappeared, 
but the form of the curve clearly indicates its participa- 
tion in the composition of the 
whole. 
In the following year the 
advance was much less consid- 
erable. The maxima at 26 and 
34 and that near 47 became 
more distinct, but the maxi- 
mum number of rays increased 
to 67. At the same time an- 
other still more important dif- 
ference appeared since now for 
the first time ligulate florets 
appeared between the tubular 
florets of the disc. This only 
occurred on a single plant and 
not till the beginning of Sep- 
tember. This plant had 66 
rays in its terminal inflores- 
cence, and was one of those 
which had been selected as seed- 
parents, and accordingly isolated at the beginning of the 
flowering period. On account of its possession of this 
first sign of real doubling it was chosen for the continua- 
tion of the experiment in 1900, to the exclusion of all 
the rest. 
It is well known that in other species of this genus 
( e. g.. Chrysanthemum indicuui and C. inodonun) the 
doubling consists in exactly the same phenomenon. In 
Fig- 33- Chrysanthemum se- 
gctiun plenum. One of 
the six inflorescences 
which in 1899 first exhib- 
ited true "doubling." The 
figure represents the par- 
ent plant of the "double" 
variety. 
