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Dec. 29th. 1878

Pisum sativum

movement of Tendril with respect to light

A young plant which had been illuminated rather on one side in Hothouse, had position reversed when placed before N.E. window. on clear warmish day. Sides & Top darkened open behind to room.— Stem secured at base of tendril trifid.— Mark on top of stick.— tip of t & thus mark brought into line — traced on Horizontal glass from 8° 20' a.m to 10° 50' P.m, by which time tendril bowed & growing old & the next morning & Dec. 30th 6° 50' a.m. The straight course pursued from 8° 53' to 12° I am inclined to attribute to t. being having in Hot-House become bowed towards light, & when position of plant reversed, it travelled in straight line to light, & afterwards circumnutated — From After 12° to I can see no signs of Heliotropism or Apheliotropism.

Dec. 30 Two young tendrils were observed the Pot having been reversed compared to yesterd; they moved from the light till, in one case between 2° & 3°, & in other case between 3° & 4°, so that it certainly looks as if they were apheliotropic — Both made a single irregular ellipse in course of day.— I do not know what to think & case had better not be mentioned.—