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Vicia faba

(Circumnutation of Leaf)

Plant 18 inches high in pot, drawn up by having gone having grown in greenhouse.—

Young leaf, measured to end of terminal leaflet 3.1 inch – with filament affixed to one midrib of one of 2 terminal leaflets: stem [sketch] secured to stick at base of leaf— observed under skylight. Temp. between 17° & 18° C.  See tracing — Apex of leaflet 7 1/4 from vertical glass.— Fell in morning — & then rose greatly falling down to level from above ─circumnutated in middle of 2d day (& this most trustworthy as accustomed to position.) & fell each night. Consider tracing:— The change in position was so great that I also measured angles. At 12° 20' on July 3d The petiole together with terminal leaflet, stood 43° 30' above horizon; it had stood rather lower for (it occupied this high angle owing to being young & light coming from above): at 7° 20' P.m stood 57° above horizon;  & at 10° 45' P.m. 62°. [calculation not transcribed] above horizon; so had risen 19° between noon & nearly 11° P.m. [calculation not transcribed]

Next morning (4th) it stood at 10° 20' a.m at 39° above Horizon so that between this Hour & night had risen fallen? 23° 30'— (I had better begin with this angle at 10° 20' a.m.)—

We have here an approach to sleep movement, so common with Leguminosæ— does not Linnæus say sleeps??— (Used)

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Vicia faba

Circumnutation of terminal leaflet.

July 4' The main petiole was now secured to stick close to base of 2 terminal leaflets, & movements of 1 of latter traced under similar circumstances.— Length of leaflet 1.4 inch, distance of its apex from vertical glass 6 3/8 of inch, so tracing not quite so much magnified as that of whole leaf

Temp on 4th 16 to 16 3/4 C. & on 5' 18° C.

See tracing — General movement like that of Petiole whole leaf, & much of latter movement evidently evidently due to movement movement of leaflet. — Began to fall earlier at night from in the alm about 9° or 9° 30 moved to right right & fell a little— On 5th the circumnutation between 8° 30' a.m. & 4° P.m very remarkable. — Consider tracing in comparison with that of whole leaf.—

The leaf & leaflet both observe observe undergo a daily periodic movement