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Sept 8th 1879. Solanum lycopersicum.—

Last night cotyledons of several seedlings vertical— placed in dark cupboards this morning at 7° 30' almost horizontal pretty widely open. Kept in darkness except for about 10' whilst Hypocotyl fixed by shell-lac & thread to little sticks, & very fine glass filaments with little triangle fixed to tips of 2 Cotyledons & at 8° 7' a.m placed under Bell-glass on study Table & kept quite quite dark, except at observations rather short & then very dimly illuminated.— Temp. 62° to 65° F

Nevertheless on 2d day the hypocotyls were became bowed slight to side where there was a distinct dimly lighted window which (at intervals) gave me light enough to observe.

No (1) Cotyledon— continued to fall all day till 1° 33' when thy both were horizontal— for after another hour had risen a little, & then again fell greatly till 10° 5 P.m. when at by which hour they ought to have risen become vertical greatly in evening. But in the course of night reversed course & rose considerably by 7° a.m; they & continued to next morning morning to rise till 9° a.m, then stood still for about an hour but by noon had fallen.

[in margin:] (Work in with Lychnis Githago, when I show that it is periodicity of movement which is destroyed by want of light.)

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Second Plant.— continued falling, but in zig-zag line till 1° 30', then rose a little, & then for whole rest of day circumnutated on small scale about same spot, so that by 10° 5' P.m. (instead of having risen greatly, was almost exactly on the same spot as at 7° a.m.— instead of having risen greatly, as it ought to have done.

During night, moved a little laterally ie by 7° am; but by 9° a.m on next morning had risen a little; by 10° 20' had fallen to old level & by 12° had again risen a little.)

It is therefore clear that Cots of Tomato circumnutate a little in as complete darkness as it was possible to keep them completely [comparatively] with observations about every every 2 hours— Darkness does no destroys, circumnutation, but the periodicity of the movements & when these are great as with sleeping plants this result is very conspicuous.