[78]

1881.

Cassia floribunda

July 26 Drops put on at 11˚. a.m.

2 pair of young tender leaflets fully expanded on uppermost leaf not fully expanded — 2 pairs on 2d leaf almost fully expanded & 5 pair of leaflets on 3d fully expanded leaf all on right side, viewed from apex — Sponged well with water at 96°.

Middle portion of leaf near midrib extremely greasy — Plant in cool greenhouse

Leaves quite free not pinned or covered

Drops allowed often to dry —

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

Aug 22d I have noticed for some time that opposite leaflets which have not been wetted are often a little curled up laterally whilst those with drops are not so curled. —

Aug 25' F. made very thin slices — Surface of epidermis no bloom, but thickly studded with extremely minute refractive points or beds, to which I suppose air adheres & which prevents water adhering to surface. —

[78v]

Aug 6' even washing with S. Ether does not make water adhere at all well— water can be blown off leaving surface dry

Aug. 26 washed with sponge & Soap some leaflets but this did not remove greasy appearance for on afterwards shaking the leaf, the leaflets instantly appeared quite dry over considerable spaces. —)

[79]

Cassia

Aug. 30' In all the 9? leaflets on which water has been placed, excepting 2, the extreme tips are brown or dead — What injures leaves & W so much, less exposure what would injure in slight degree —

Sept 7th in evening I ceased to add water —

11th

Sept 11th nearly same result as on Aug 30th —

6 plainly injured — 2 slightly 1 not at all.

The injury confined to tip of leaflets. —

Oct 10' no change; the tips seem rather less injured

Oct 28 no change