The Origin of Clirysaiitlicniiim Scyctmii Flciiiiiii. 167 



In all 221 and 104 flowers were examined. The 

 curves are mononiorphic and symmetrical. 



The same is true of this species in Thuringia. Ludwic. 

 gives tlie following data derived from 1000 plants col- 

 lected at Brotterode.^ 



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 



12 13 14 15 16 17 18 19 20 21 22 23 

 I 14 13 4 6 9 7 10 12 20 1 



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.' 



l)e a dimorphic curve (Fig. 30), which at the time was 

 the first compound curve to appear in botanical literature.'" 

 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 



^ F. LuDWiG. Ueher Vanafionscurven mid Variationsilachen, Bot. 

 Centralbl., Vol. FXIV, 1895, p. 5. Also F. Ludwig. Die pAanzUchen 

 Fariatiotiscuncii und die Gouss'sche Wahrscheinliehkeitseurve; same 

 journal, Vol. LXXIII, 1898, p. 71 (p- 16 of the ofl'print). 



"From the Archiv f. Entzvickelungsmechanik, he. eit., p. 58. 



^ Archiv fiir Entivickelungsmeehanik, 1895, loc. eit. See also 

 Ludwig in Botan. Centralbl., Vol. LXIV, 1895, p. 71. 



