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Dec. 25 /77. Acacia lophantha. The Cots. rise above surface but then consist of brown empty husks, which soon drop off.— First leaf pinnated with 11 leaflets on each side. These are protected by bloom on both surfaces. Do not seem sensitive to touch, or hardly sensibly so, though I syringed one for several minutes with water at 90° F.

Dec. 28. The leaflets on the above first leaf go to sleep well— leaflets rising & meeting each other & pointing to apex. The whole leaf is straighter during night than day: the chord from apex to basal joint forming angle of 126° during day & 142° at night (see back)

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[sketch and calculations]