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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 — 8° 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') 8° 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' 8° a.m. The pot was now turned round so that black tips pointed to light: by 7° 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 45°. (It is clear that the action of light during day is prolonged during night.—)

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

Aug 2d. 7° 30' a.m. Painted stands at right angles to light; but by 10'° 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.