[86]

1881

Robinia pseudo-acacia.—

July 25' 12˚ 15 P.m.— Plant in pot in cool greenhouse, growing well — 3 leaflets on very young, but nearly full size, on uppermost leaf, marked with white thread. These & 3 opposite ones — sponged with water about 96°, till bloom removed, but they yet remained very greasy. — Also 4 leaflets, on Right side (viewed from apex) 3d leaf from apex, similarly treated, as well as the opposite ones, making 7 with drops & 7 without drops.

As window generally open — these leaflets quickly dried & fresh drops often put on (in all case— between 7˚ 30' a. m & 7. 30' P.m) — During sleep these leaflets wd not touch opposite ones.

Aug 2d. noon no effect, Drops temporarily discontinued after morning of 3d till 5th (2 days intermission)

(Latterly only 3 times per diem. Aug. 25 I now see tips of several leaves, a little inwardly curled or slightly blackened, & this is where

[87]

Robinia

drop of water often hang, when leaf leaves well wetted. — Ceased putting on water on Sept 7th evening — Sept. 11th. Of the 8 leaflets thus treated, 6 are distinctly injured at the tip where water was apt to lodge, & the 7th terminal leaflet, half of which was wetted is also injured at tip, though to very slight degree

Sept. 26th placed out of doors, 3 of leaflets on which water rested conspicuously yellower over whole surface than the opposite leaflets or many others on leaves.

Oct 10th 3 leaflets which had are now conspicuously more decayed & yellower (the greater yellowness has been observed for a long time.) than the opposite cleaned leaflets — there is no great difference in the other leaflets; but the tips seem worse, & more curled in & decayed.

Oct 11th. — The above 3 leaflets had fallen off & no others on the 2 leaves. — This interesting, as except extreme tips no oth the leaflets did not externally appear the least injured by the water. —