The Variation of Animals & Plants Under Domestication, volume 2
The Variation of Animals & Plants Under Domestication, volume 2
Darwin, Charles, 1809-1882
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Digitized by VjOOQ iC 190 STERILITY [chap, xviii believe that seeds kept during many years, and seeds believed to be imperfectly fertilized, yield double flowers more freely than fresh and perfectly fertilized seed.*^ Long- continued cultivation in rich soil seems to be the commonest exciting cause. A double narcissus and a double Anthemis nobilisy transplanted into very poor soil, has been observed to become single ; ^ and I have seen a completely double white primrose rendered permanently sin...gle by being dividea and transplanted whilst in full flower. It has been observed by Professor E. Morren that doubleness of the flowers and variegation of the leaves are antagonistic states ; but so many exceptions to the rule have lately been recorded,^**® that, though general, it cannot be looked at as invariable. Vari^ation seems generally to result from a feeble or atrophied condition of the plant, and a large proportion of the seedlings raised from parents, if both are variegated, usually perish at an early age ; hence we may perhaps infer that doubleness, which is the antagonistic state, commonly arises from a plethoric condition.
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