[126 and 127]

Fig. 24'

light

Fig. 24 1/3 scale No lettering

Cerinthe Oct 25

Cerinthe major: circumnutation of Hypocotyl traced on horizontal glass from 9° 26 a.m to 9° 53 P.m. illuminated from above. Filament fixed horizontally to summit of hypocotyl. Movement of the bead magnified about 30 times & 10 in figure given.

[127v]

10

in all cases pollen from a distinct plant of the same form; & therefore it may be observed that I have used the term 'own-form pollen' in speaking of the illegitimate unions. The several plants in all the following experiments were treated in exactly the same manner, & were carefully protected by fine nets from the across of all visits, excepting Thrips, which it is impossible to exclude. I performed all the manipulation myself, & weighed the seeds in a chemical balance; but during many subsequent experiments I followed the more accurate plan of counting the seeds.

some of the capsules contained no seeds, or only two or three & these are excluded in the column marked headed 'good capsules' in several of the flowing tables, capsule

[Proof sheet with corrections, pasted on]

[Forms of flowers, p. 24: "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. The several plants in all my experiments were treated in exactly the same manner, and were carefully protected by fine nets from the access of insects, excepting Thrips, which it is impossible to exclude. I performed all the manipulations myself, and weighed the seeds in a chemical balance; but during many subsequent trials I followed the more accurate plan of counting the seeds. Some of the capsules contained no seeds, or only two or three, and these are excluded in the column headed "good capsules" in several of the following tables:─"]