The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . and flowers wnth normal sta-mens are met with. In such cases it is usually obviousthat favoral)le conditions tend to increase doubling,a fact which has been known for a lono- time in thecase of Anfliciuis nobilis, of some species of N^arcissus, * K. , Bcitrdge ziir Kenntniss gcfiilUcr BUithcn, in Prings-iieims Jahrb. f. wiss. Bot., Vol. ly, 1886, p. 207. ^ Ueher halhe Galton-Curvcn ah Zeichen discontimdrlicher Varia-tion. Ber. d. d. bot. Ges., Vol. XII, 1894, P- i97- Which is, however,
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . and flowers wnth normal sta-mens are met with. In such cases it is usually obviousthat favoral)le conditions tend to increase doubling,a fact which has been known for a lono- time in thecase of Anfliciuis nobilis, of some species of N^arcissus, * K. , Bcitrdge ziir Kenntniss gcfiilUcr BUithcn, in Prings-iieims Jahrb. f. wiss. Bot., Vol. ly, 1886, p. 207. ^ Ueher halhe Galton-Curvcn ah Zeichen discontimdrlicher Varia-tion. Ber. d. d. bot. Ges., Vol. XII, 1894, P- i97- Which is, however, by no means always the case. See the ex-periment with Ranunculus bulhosus in §23 of this part. Double Fhrucrs and PlozvcrJicads. 199 and other bulbous plants.^ There is a certain periocHcityin this case too; for sometimes the hrst, but more usuallythe later, flowers are less double than those which bloomin the height of the flowering period. This fact is wellknown to breeders,- especially in the case of certaindouble varieties of Begonia in which seeds can only besaved from the autumn
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