[44]

Jun 13th 1878 Cassia neglecta (Cotyledon) Sensitiveness F. M. seeds

1. seedling Rt Cot stood 10º above horizon & left Cot stood 29º above do.— burnt b with Lens legs left cot, after 12' the left stood at same angle, but after about 20' stood at 55º above horizon; the left then stood some 70º above horizon

No

So left rose more slowly but, 45º.

[in margin:] If burning sensation transmitted to opposite Cot.

Another seedling Rt. Cot stood 11º below horizon & left stood 15º above— Left was burnt with lens & sun; & after about 20' stood 55º above horizon.

The right then stood 17º above horizon after only 12' & so had risen, 28º, but I it afterwards stood at same angles at the left one, & if so had risen, (11º + 55) = 66º. But I am not sure at all that burning was cause it may have been sun from having been brought out of window in study; or it may have been shaking from wind.

[45]

C. neglecta

Jun 14' 8º 20' a.m. Cots almost horizontal exposed for 3' to wind at temp 50º (cloudy) which caused the cots to vibrate & I shook pot a little — After 30' no change or movement.

Cassia neglecta

Jun 20' the Pot Kept in study & so no sun placed for 17' in very moderately bright sun-sh sun-shine no effect, brought back into study, & when looked at after about 20' 1/2 Hour (time not recorded) a cot. of young seedlings which had been horizontal had risen 65º above horizon — an older seedling with a true leave partially unfolded had risen 37º & a still older only 15º. I suppose it is change from bright light into comparative darkness

Light Both Cots rose:

By 1º 20' Cot had become horizontal again on study Table.

At 1º. 21º same day put out into verandah, to the S.W where sun was

[45v]

shining most but not all of time & brought in at 2º' (ie exposed for 40') & placed on study Table.— by 2º 16' the cots of younger seedling had risen 25º above horizon.

Light

The cots of older seedlings not having risen. By 2º 26' the younger Cot stood at 68º! & now the Cot. of one of the older seedlings stood at 35º & 42º above Horizon — Shows how wonderfully sensitive to obscure light (for rooms to N.E yet not dark) & I must not in the least trust the effects of burning Lens.

At 2º 36' younger Cot. stood at 71º above Horizon. — By 2º 42' cot had begun to fall or open for now the observed one stood at only 63º above Horizon.—

3º 45 nearly Horizontal again

[46]

Cassia (unnamed sp. from F. Müller) from Itajahy

July 18. 1878

Cotyledons long & narrow— from one trial are not sensitive.— Sensitive

10º almost completely shut or asleep

19th tried both cots. by pinching, & scratching for 1' with pin & I cd see no trace of sensitiveness.— (Used)

Light

(a seedling put into bright sun at 11º 25' removed from sun at 12º 35' pm & put into my washing corner, very obscure light at 12º 15' no effect, but at 12º 30' ie 30m Cots at angle of less than rectangle more than 45º together) 1ºpm 1º 30 Cots Horizontal again on Study Table)

July 22d in Hot-House— Rubbed 3 Cots on different plants & both cots on 4th seedlings, each for 30" with little stick & produced no effect. (Used)

I then rubbed & pricked pulvinus with pin, & the 2 Cots, which were horizontal, stood formed together after some minutes an angle of 111º (instead of 180º & again after some minutes an angle of only 69º instead of 180º, so each had risen 59 1/2º.

So Pulvinus sensitive