[176]

Trifolium resupinatum (S. Europe ⨀ Steudel)

Aug 17' /77/ The basal 1/2 of lower side of leaf which is wetted & not silvery looks to naked eye different & is more polished, just what might not have been expected & cells look different. (The German's notion (vide German) that the 'lower side of terminal leaflet of Trifolium may absorb dew is contradicted by this surface being strongly repellent of water in the other species.)

There is nothing in the day or night which will account for the 2 halves differing— At night the upper bloom-protected half lies more under the protection of the terminal overarched leaflet, whilst, the lower half on the other hand is rather better protected from rain, dew or radiation by the mid-rib projecting a little, so that the lower half sits inwards a b lies a little protected by midrib.—

[sketch] section of 2 lateral & terminal leaflets during sleep

The first leaflets after cotyledons, which is formed is single & goes to sleep by standing vertical & a little overarched like the terminals leaflet of perfect tripartite leaf.—

T. repens & T. pratense ought to be compared

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Trifolium resupinatum

Aug 26 11° A.m. 3 leaves submerged by weight in F. W 1 of them had petiole a little cracked before hand, but leaf quite fresh, & the other had petioles angularly bent in act of submersion.

28th 8° A.m the bloom protected leaves half dry whilst the other half wet—

After fine rain the basal lower half wet, not so the the bloom-protected half.— This latter fact observed twice.

31' The bloom-protected sides of submerged leaves now a little considerably wet

Sept 7' no difference in state of 2 sides— both green & fresh.—

— 15 2 of the leaves beginning to get yellow

20' 2 of the quite yellow with cracked petiole— The 3d leaf has 2 lateral leaflets still pale green & terminal one pale yellow— No difference in the 2 halve halves of the lateral leaflets)

Sept 21. some of the lower leaves becoming yellow from age, no difference in the 2 halves.

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Trifolium resupinatum— Melilotus. Lotus — Rhus

Sep. 27 cleaned 2 leaflets (1 cot. 1 term.) on 3 leaves both surfaces & marked white thread.

Also pinned down 3 pairs of leaves; half 3 with upper surfaces exposed to radiation & half 3 with lower surface.

Sept 27th 2 pairs of leaves of Melilotus Taurica similarly pinned.

Sept 25th?

about 2 days ago I similarly pinned some leaves of Lotus aristatus & peregrinus.

Sept 27

Rhus cotinus. I tied 5 pairs of leaves together so as slightly to overlap. Brown wool

Oct 4' Leaves now generally slightly purple & the overlapped portion seems greener. I have hardly a doubt

Oct 7th there is a wonderful photographic picture on each underlying leaf (gathered one pair) of the shape /over

[178v]

of portion of overlapping leaf.—

(Oct 7th. 4° P.m.— tied some more pairs together — one set covered with flannel at night — & another set protected from light all day).

Oct 19' 22d those covered at night & exposed during day show protection of the covering leaves; whereas those covered during day & exposed to night frost do not show the change of red colour ∴ clearly effects of light.

M. Chevreul has recently Academy of Sciences shown that with a tissues the coloring depends on light in part— change in the Chlorophyll.