The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. QT. Raphanus Raphanistrum. A cotyl pitcher ex-panded in the form of a disc. A, from the side; B, thesame, seen obliquely from above and showing the plumule. amphi-syncotyls are especially backward. The extent ofthis influence cannot, as yet, be measured; but the factthat syncotyls are so much rarer than tricotyls may per-haps be explained by this check on their growth. Some-times the plumule breaks sideways through the cotyl-pitcher by splitting its lower part (Cenfranfhus macrosi-phon, M
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. QT. Raphanus Raphanistrum. A cotyl pitcher ex-panded in the form of a disc. A, from the side; B, thesame, seen obliquely from above and showing the plumule. amphi-syncotyls are especially backward. The extent ofthis influence cannot, as yet, be measured; but the factthat syncotyls are so much rarer than tricotyls may per-haps be explained by this check on their growth. Some-times the plumule breaks sideways through the cotyl-pitcher by splitting its lower part (Cenfranfhus macrosi-phon, Mercurialis annua). Sometimes it succeeds, althoughvery late, in elongating in the normal direction. InHelianfhus annuus I have sometimes operated upon such Figured in Bcr. d. d. hot. Ges., Vol. XTT, PI. TT, Figs. 3 and 4. Hcnii-Syncotyly, Syncotyly, Auiphi-Syncotyly. 461 ])itc]iers by splitting them up along one side with a sharpknife, as soon as I saw that the plant would not growwithout this help. By this means I succeeded in bringingthe plants to flower, but they were weak, thin-stemmedindivid
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