The Oricjin of Chrysanthemum Scyetnm Plenum. 167 
In all 221 and 104 flowers were examined. The 
curves are monomorphic and symmetrical. 
The same is true of this species in Thuringia. LUDWIG 
gives the following data derived from 1000 plants col- 
lected at Brotterode. 1 
DATA FROM THURINGIA. 
L. F. 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 
Inflorescences 1 6 3 25 46 141 529 129 47 30 15 12 8 6 2 
We may therefore assume that the mean number of 
rays for the wild corn-marigold is 13. 
I investigated the mixed race occurring in botanical 
gardens for the first time in 1892. The result proved to 
I! 12 13 14 15 16 17 18 19 20 21 22 23 
I 14 13 4 6 9 7 10 12 20 I 
Fig. 30. Chrysanthemum segetum. Mixed crop. Curve of 
the ray-florets in the primary inflorescences of 97 indi- 
viduals in 1892. The upper series of figures gives the 
number of rays, the lower series the number of those in- 
dividuals possessing the scale character written above it. 2 
be a dimorphic curve (Fig. 30), which at the time was 
the first compound curve to appear in botanical literature. 3 
I had obtained the seed for the experiment by exchange 
from a number of botanical gardens. I mixed it thor- 
oughly and sowed it on a single bed, where 97 plants 
1 F. LUDWIG, Ueber Variationscurven und Variationsft'dchen, Bot. 
Centralbl., Vol. LXIV, 1895, P- 5- Also F. LUDWIG, Die pftanslichen 
Variatiojiscuri'cn und die Gauss'sche WahrscheinUchkcitscurve; same 
journal, Vol. LXXIII, 1898, p. 71 (p. 16 of the offprint). 
2 From the Archiv f. Entwickelungsmechanik, loc. cit., p. 58. 
3 Archrc fiir Entwickelungsmechanik, 1895, he. cit. See also 
LUDWIG in Botan. Centralbl., Vol. LXIV, 1895, p. 71. 
