[95]

1881

Aggregation Dripping

Acacia lophantha. Sept 7th 12˚. Drops fairly sized from height of 39 inches

Sept 17th 4˚ 30' P.m — I find 3 leaflets disarticulated & 1 still attached with a little infiltration.

Sept 18th 7˚. 30' a.m. This morning 5 more disarticulated making 8 leaflets, with 3 of them a little infiltrated. — In evening several more leaflets fell off

― 29 I find many adjoining leaflets on adjoining pinnæ which were hit by spray have disarticulated themselves & dropped off

[96]

1881.

Dripping

Sea-Kale — Cut off leaf with end in water, placed on Sept 18th 11˚ 55' under drip — of height of 5 ft 1 inch: drops rather small: — say 2˚ or 3˚ P.m started

Sept 23d. noon— The part on which drip fell now plainly infiltrated. — left leaf to become dry. —

― 25. The dipped parts are now black dead & drying up.

[97]

1881.

Dripping

Colocasia antiquorum(vel Celandine) leaf with excellent bloom, placed under drip 4˚. 10' P.m Sept — 12th. Height of fall 29 inches.

14th noon several small spots of infiltration???— The leaf though it looks thick is really thin, & not but it us odd that it shd. so soon be infiltrated. —)

Sept 27th removed from under drip, not injured in the least & leaf marked with string.—

― 30th 5˚ P.m. The part on which drip fell — now yellow, but not more yellow than a large surrounding space, on which the spray fell.

Oct 10th The spot where drip fell, a little browned

28 whole leaf withered & died

If do not act show that infiltration not easily caused in all cases & use of bloom not to protect leaves from water

[98]

1881

Dripping

Cassia floribunda. Sept. 12. 9˚ 50' a.m — Height of fall 39 inches

Sept 29th noon removed from under drip — not in the least affected. Red Wool. — one adjoining leaf had been a little injured by an accident, & this part long ago rotted from the spray, & the leaflet long-ago disarticulated itself —

― 30th no sign of injury

Oct 10' no change— tips seem less injured.

Oct 28' Large round decayed piece in leaf, near the border, but the drip was near midrib.

[99]

1881— —

Dripping

Crinum Capense — leaf with excellent bloom placed at 4˚ 10' P.m. Sept. 12' under drip, fall of 36 inch,

Sept 29th noon, removed from under drip not in the least affected; though leaf resting on a pot — Red Wool

Oct 10th no change.

― 28. do.

(1

1881. Dripping Machine.— Desmodium gyrans

Young Bush.

Aug. 8' — fine young healthy leaf, marked Black Wool resting on 2 varnished wires so as to extend horizontally, with glass pipe & siphon dripping water of temp. of Hot-house. from height of 11 inches— drops as large as during slight thunder-storm — hot on lamina on one side of midrib — Drops at first 170 per minute, but soon became slower.— Drops, though thus interrupted began at 2˚ 45; P.m — All First evening water thrown off in spheres, so that leaf not at all wetted.—

(Aug. 9th 11˚ a.m the drops have been so often interrupted, that 12˚ may be subtracted from commencement.— I have just syringed leaf for few minutes with water at 95° to remove bloom on spot where drops fall)

(Aug 10th at least 30 hr. must be subtracted from commencement as I have just found out that the leaf moves away at night now fixed. —)

(2

1881

Dripping Machine —

Oxalis sensitiva

Aug 10th. at 3˚ P.m. Youngish leaf placed between 2 legs of Hair-pin so that they cd not descend, & whole leaf fixed. — & middle leaflets. vi on right side, viewed from apex — placed under drip. — Nozzle of pipe 40 cm f above leaf.

N.B drops fall chiefly not far from base on left (Desmodium p. 1) of midrib (viewed from apex) — There have been many interruptions since the 8th — Removed from under drip at 10˚ 30' on 13th. —

Aug 15. One of leaflets of the Oxalis on which drops fall fell off this morning when touched &, but this had been injured by poison from wire. — — (Other leaflets injured by brass wire round Hair-pins.) & now leaf moved a little so that leaflets nearer apex on right side (viewed from apex) received the drops, probably wetted before — (18th 10˚ a.m leaf & plant removed from beneath drip. — marked with 2 red threads

22d does not seem injured

(3

Aug 13th

Dripping

Desmodium fresh young is leaf. Drops now fell from height of 4 ft on midrib. 11˚ a.m.

(—15' this leaf much injured by knocking against pins — removed at 11˚ 15 a.m. from under Drip. — marked by petiole tied to long pin Black wool & yellow wool. —

Aug 15' 11˚ 15' a.m. leaves laid on web of elastic on caoutchouc threads & same 4 ft drip as before falling on. — White thread Leaf lost (not marked)

(Aug 16th new leaf resting on bed of cotton wool.

9˚ 15' a.m — Drops fall now only 39 inches. —

Aug 21st Leaf unfortunately broken off— now no local injury whole leaf rather pale, with perhaps a tinge of brown along midrib.)

(22d Possibly it disarticulated itself)

(3 4

Dripping

Aug 18th

Mimosa pudica leaf with bloom not removed placed on cotton wool & placed under drip. at. 10˚ a.m Height of drip 22 inches

Ninth leaflet from base on right side (viewed from apex) struck by drops — Sleeps at night. — The drops did not always strike at exactly same point & were often found striking the e leaflets in advance. These now Aug 20th noon are mottled & pale coloured & clearly much injured. —

Aug. 21. many 4 leaflets fallen off — lea killed.

(Aug 21st 10˚ 30' a.m — new leaf started from height of 22 inches & bed of cotton wool flatten — Perhaps sat 11˚, as drops did not at first strike open leaf. —

Aug 22d 4˚ 40' (ie 32 days) since 1˚ noon 4 leaflets on which drops fell have disarticulated themselves ─ They are markedly paler & of a yellowish tint & with transmitted light more transparent compared with other leaflets on same pinna, which have been wetted with spray & have rested on the wet cotton. —).

(5

Dripping

Desmodium. Aug 21'. 11˚ a.m. started new leaf on cotton wool, drip high.

22d. 4˚ 30' P.m. looks pale

23d Shoot broken by having been so much bent

Desmodium: Aug 23d. 10˚ a.m leaf on cotton wool exposed to drip from height of 46 inches. Drops large, but wd not fall with so much force as some during thunder storm.

24th 4˚ 30' P.m. (ie after 30˚ 30') several small infiltrated spots close together; yet drops have not always fallen on same exact spot. — see Back for size of drops

(25th 23 7˚ 20' a.m. The small infiltrated spots have all run together (& drop now changed so as to fall nearer apex, yet near middle of leaf 26th 4˚ 20' P.m some infiltrated spots, made since 25th 7˚ 20 a.m & yet drops did not always fall on same exact point. ie after 33 hrs. —)

27th 7˚. 30' a.m— many infiltrated specks— yellow wool — stopped drip

Aug 29th The infiltrated spots have turned brown & are killed. —

[5v]

In all cases drops fell from inclined glass tube drawn out into fine point. —