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May 29th—

Bean-roots Horizontal in cold water

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Four young radicles of Bean were fixed horizontally, so that lower surface touches water kept by ice at temp 43° to 46 F, the upper surface often wetted but only temporarily. As ice added water sucked out— Vessel not covered up. Temp of air 16 to 17° cent.— Immersion began at 9° a.m. by 7° 15° P.m tips of all distinctly bent towards centre of earth; no tendency to curl up from water.—

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flowers fertilised by pollen from a distinct plant yield more, sometimes many more seeds, than flowers fertilised with their own pollen; and they commonly set a larger proportion of capsules. The degree of infertility of the self-fertilised flowers differs extremely in the different species, and even, as we shall hereafter see in the section on self-sterile plants, in the individuals of the same species, as well as under slightly changed conditions of life. The infertility ranges from zero to fertility equalling that of the crossed flowers; and of this fact no explanation can be offered. Some few however of the fifteen cases in the two tables