(1

Solanum palinacanthum

Movement of seedling, whilst Cots buried in ground

Dec. 13th — A seedling forming forming arc with cots. still under ground. The arc projected .18 above ground had glass filament affixed to the hypocot. stem

[sketch] (level of earth)

& traced on Hor. glass in Hot-House, protected from lateral light.

See diagram.— movement cannot be trusted after 3°. 5', as filaments become loose — Before that zig-zagged so much, that probably nutates. I see the seedlings on this state seem generally have little open space round them. Stem Hairy—

Dec 14th I traced in same manner same part of another & equal-aged seedling, but at 4° 30' I found filament resting against card with mark. The large movement at first probably due to my having erroneously removed Earth on one side alone to which it bent. Yet I th can hardly doubt nutated at this early age. —see diagram.

(Dec. 16 tried 2 more seedlings in same state as above, but fixed filament horizontally on the arc more on the back half: first of these moved chiefly in one direction as if the basal part of axis was moving back, but in a decidedly zig-zag course. The second moved also chiefly in one course & then end of filament was pressed on card, but later in evening was lifted up again. Nothing can be inferred from these 2 trials.)

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Solanum palinacanthum Dec. 17—18'

An arc of hypoct. stem projected just above ground with the Cots completely buried & glass filament fixed on top of arch, rather towards basal half, & therefore mo I tied the cotyledons to basal half. Therefore movement shown of the whole arc— traced on Horizontal glass, protected from light— Tracing Nov. 3d magnified only 13.18 times, from 9°. 20 on 17th to 7°. 15' 8. 30 on 19th— Darken Course during night shown by dotted lines. Evidence of 2 imperfect ellipses & In the zig-zag lines attempts apparently to make other circles — Explain why I tied stem in arc, ie. an account of the great disturbance caused by the straightening of the arc. Considering this & the previous tracings, there can be no doubt arched stem circum-nutates, before cotyledons come rise of ground.—

Glass filament fixed longitudinally; but obliquely.