The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . ancy from inasmuch as the interest of the practical man onlyextends to the question whether the variety can be con-veniently multiplied by seed and is not concerned withthe possibility of occasional reversions, such information,especially in older cases, can only be accepted with cau-tion. With this reservation, I propose to give a brief reviewof some of the better known instances. But before Ido this I will call attention to a very beautiful varietywhich I have not yet found describe
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . ancy from inasmuch as the interest of the practical man onlyextends to the question whether the variety can be con-veniently multiplied by seed and is not concerned withthe possibility of occasional reversions, such information,especially in older cases, can only be accepted with cau-tion. With this reservation, I propose to give a brief reviewof some of the better known instances. But before Ido this I will call attention to a very beautiful varietywhich I have not yet found described nor seen in trade-catalogues, but which has appeared in my own cultures. 100 Siiddoi Appearance and Constancy. Fig. 15 represents a single Dahlia, whose ray floretsare all transformed into long and broad tubes which areopen above. The same thing occurs in many other com-posites, for instance in Chrysanfheinuni segetuiu fistu-losum. Coreopsis tinctoria fistulosa, etc. On the analogyof these cases I propose to call this new Dahlia, Dahliavariabilis fistulosa. This variety arose from a crop raised. Fig. 15. Dahlia Iariahilis fistulosa, a new variety whichhas appeared in my cultures. from the seeds of D. var. Jul. Chretien, a dwarf single Dahlia with red flowers of the color of red lead, the tubers of which I had bought in 1892 in Lyons. From the seeds which I saved in that year from this variety, I raised in 1893 several plants of which one had a white flower. I only sowed seeds of this in 1894.^ It was T have unfortunately not yet succeeded in fertilizing Dahliasartificially by their own pollen. Horticultural Varieties Arisen Suddenly. 101 in the crop thus raised that the plant whicli bore theflower head shown in Fig. 15 appeared. The color wasdark carmine red, not that of red lead. The flower headswere all fistulous from the beginning of June until wellinto October; but the later flowers manifested the ab-normality in varying degrees. Either the base only ofthe tube was closed
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