[44]

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

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

No

So left rose more slowly but, 45°.

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

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

The right then stood 17° above horizon after only 12' & so had risen, 28°, but I it afterwards stood at same angles at the left one, & if so had risen, (11° + 55) = 66°. 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' 8° 20' a.m. Cots almost horizontal exposed for 3' to wind at temp 50° (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 65° above horizon — an older seedling with a true leave partially unfolded had risen 37° & a still older only 15°. I suppose it is change from bright light into comparative darkness

Light Both Cots rose:

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

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

[45v]

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

Light

The cots of older seedlings not having risen. By 2° 26' the younger Cot stood at 68°! & now the Cot. of one of the older seedlings stood at 35° & 42° 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 2° 36' younger Cot. stood at 71° above Horizon. — By 2° 42' cot had begun to fall or open for now the observed one stood at only 63° above Horizon.—

3° 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

10° 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 11° 25' removed from sun at 12° 35' pm & put into my washing corner, very obscure light at 12° 15' no effect, but at 12° 30' ie 30m Cots at angle of less than rectangle more than 45° together) 1°pm 1° 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 111° (instead of 180° & again after some minutes an angle of only 69° instead of 180°, so each had risen 59 1/2°.

So Pulvinus sensitive