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1878

Bignonia capreolata

July 27th covered all tips of one tendril (except 1 lateral branch which was cut off) with gold-beaters skin painted thickly with Indian ink & left opposite in natural condition— By exposed to N.E window surrounded by boxes except facing window— The t. was rather too old & was rather weighed down by weight, but certainly by late in evening the one with middle tips most turned to dark side of case.—

July 29th — 8º 15' a.m. painted with oil & lamp-black all the tips of 1 very young scarcely expanded tendril, & painted one lateral branch on opposite tendril & exposed as before. In evening painted t. showed some tendency to turn most to dark side, & next morning (31') 8º a.m this painted t. was turned completely & accurately to dark side, with the basal part curved; opposite t. not so the others. Looks as if tips inhibitory, or that whole tendril tips being blinded made lower & basal part of t. more sensitive. The one little lateral branch on the unpainted opposite tendril not affected

(July 31' 8º a.m. The pot was now turned round so that black tips pointed to light: by 7º 30' P.m. the sub-branches was were curved from light to the dark sides, but not the main basal part; the opposite t. somewhat curved from light, but still inclined upwards at angle of 45º. (It is clear that the action of light during day is prolonged during night.—)

Aug 1' 8º a.m. both tendrils curved from light to dark side: Pot having been was now placed last night in Hot-House.

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Bignonia capreolata Heliotropism

Aug 1' 12º 15' pots slewed round so that black tips & unpainted tips all face light, Pot surrounded as before with boxes & covered above with cloth; at 6º P. m. & still more clearly at 8º P.m, the unpainted turned most from light.

Aug 2d. 7º 30' a.m. Painted stands at right angles to light; but by 10'º 15' a.m it had now pointed to dark side; so now this t. seems somewhat paralysed & move slower than unpainted.— Probably injured by oil & black.—

Painting tips of t'— either by darkness or by excitement making t' more apheliotropic This turns out all an illusion— I believe.