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Fig. 20

Vegetable Marrow — nutation of stem of Cots. Nov. 2d

Kept in dark. — Horizontal glass.

Cucurbita ovifera: Fig 20 circumnutation of the hypocotyl, after becoming straight & vertical, traced on a horizontal glass in darkness, between 8° 23' am. & 8° 30' P.m. Filament fastened horizontally across summit of hypocotyl. The movement of the bead magnified about 18 times, but only & 4 1/2 times in the figure given. —

[Figure]

[256v]

other forms may be conveniently called for reason no one shall hereafter are [illeg] be made clear a legitimate union from reasons hereafter made clear; & that of either forms with its own-forms pollen an illegitimate union. I formerly applied the term 'heteromorphic' to the legitimate unions, & 'homomorphic' to the illegitimate unions; but after the discovering the existence of trimorphic plants, in which many more unions are possible, these two terms ceased to be applicable. The illegitimate unions of both forms might have been tried in these ways" for a the a flower of either for instances of the long-styled forms or short-styled forms might may be have been fertilised with pollen from the same flower, or with that from another flower or the same plant, or lastly with that — from the flower on a distinct plant belonging of at the same form. But to make my experiment perfectly fair & to avoid t any evil result from self-fertilisation or two close interbreeding, I have invariably used employed for the illegitimate unions of all the species.

[Forms of flowers, p. 24: "The fertilisation of either form with pollen from the other form may be conveniently called a legitimate union, from reasons hereafter to be made clear; and that of either form with its own-form pollen an illegitimate union. I formerly applied the term "heteromorphic" to the legitimate unions, and "homomorphic" to the illegitimate unions; but after discovering the existence of trimorphic plants, in which many more unions are possible, these two terms ceased to be applicable. The illegitimate unions of both forms might have been tried in three ways; for a flower of either form may be fertilised with pollen from the same flower, or with that from another flower on the same plant, or with that from a distinct plant of the same form. But to make my experiments perfectly fair, and to avoid any evil result from self-fertilisation or too close interbreeding, I have invariably employed pollen from a distinct plant of the same form for the illegitimate unions of all the species; and therefore it may be observed that I have used the term "own-form pollen" in speaking of such unions."]