The Origin of Chrysanthemum Scyctum Plenum. 185 
This 66-rayed plant was the first of my race to betray 
the fact that it contained the much desired double char- 
acter. From this moment the attainment of my object 
was assured. 
The six first "double" inflorescences referred to, had 
about 40-50 ray-florets around their circumference and 
moreover one to three in the disc. But as they flowered 
too late to ripen seeds, I have photographed and pre- 
served them (Fig. 33). 
Unfortunately this plant gave but a poor harvest, 
producing only 31 plants with terminal flowerheads. A 
curve representing these heads is given in Fig. 32 under 
1900. The number of observations is of course much 
too small to furnish a proper curve or to justify the draw- 
ing of conclusions as to its maxima. On the whole, 
however, the figure indicates a definite advance over the 
earlier years, and this advance is especially expressed in 
the fact that amongst this small number there were two 
plants which far outstripped all previous ones in the 
number of their ray-florets. Their terminal inflorescences 
contained respectively 99 and 101 rays, whereas the next 
maximum expected would be 34 -f- 55 = 89. 
"Doubling" now appeared quite suddenly in full de- 
velopment in this culture (Plate II). For convenience 
of reference I shall call the white ligulate florets situated 
amongst the little yellow tube florets, "disc-tongues." 
These disc-tongues were now quite common. From no 
single plant were they completely absent if attention was 
paid to both the terminal and lateral flowerheads. But 
their number was subject to a high degree of fluctu- 
ating variability. As a rule flowers with less than 40 
rays had no disc-tongues, and the number of these in- 
creased with the total number of the outer rays. For 
