[171]

Robinia 1877

Sept 8. 11° 30'

Sponged 2 lateral & 1 terminal on 2 nice leaves with water at 88° to 90°— marked red wool Bush in greenhouse & put on drops of water — Also spheres on 4 other leaves not sponged.

The sponged leaves on left side viewed from base.

(Sept 20' freed leaves: Sept 21st no effect, or at most the faintest shade of yellow.

Sept. 25' There can now be no doubt that all the leaves especially the sponged ones are yellowish & more transparent where water lay.

Sept 26. now splendidly yellow; no shade of doubt caused much injury.—

Sept. 27 examined one of sponged leaves, the whole distal half yellow, all the chlorophyll being of a greenish yellow, with the granules much less distinct than in the green parts

Oct 1. The contrast is now very great between leaflets on which water rested & the others

[172]

Robinia. 1877

Sept 25th 8° 35' under drip, young leaf: at 12° 30' not yet wet: at 4°. P.m. large drop on leaf no longer spherical.—

Sep 26 4° P.m. I suspect small spot infiltrated.

28 7° A.m spaces certainly infiltrated, & are transparent viewed by transmitted light.— In a hour or two the leaflet became crumpled.—

Oct 1. The leaflet fell off, crumpled & dry but not brown where infiltrated, had not lived long enough.