[56]

1879

Hedera Helix

Glass-filament with triangle fixed perpendicularly

Branches of some young plants during middle of summer were found to be strongly apheliotropic & sent branches directly away from light. On Sept. 2d these same plants had 2 trailing branches tied up perpendicularly, & exposed to N.E. window & were both found for first 4 days to be decidedly heliotropic. (so were several other plants in greenhouse; some of latter afterwards became slightly apheliotropic.) After 4 first days they plainly circumnutated during succeeding 8 days up to 12th about over nearly same area, as shown shown in diagram; but bu the tracing at close was so complex that it become confused. Glass One of same the same plants was again similarly observed Sep 27th-29th, & it now circumnutated on very small scale on the same spot, & was neither heliotropic or nor apheliotropic, having having been kept between 12th & 27th Sept. in same position relatively to N.E. window.

(I suspect season of year)

(N.B I suppose from effect in Hothouse that light fr N.E window not sufficient to induce apheliotropism— but it is very odd that both in study & Hot-House the shoots were heliotropic)

Give case of circumnutation under circumnutation of stems or under Stolons I have mentioned Trailing Branches

Also worth giving under Heliotropism & Apheliotropism— — when I mention about Tropaeolum at first heliotropic & then said to be apheliotropic