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Nov. 7 /73/ Eucalyptus globulus (certainly wrong name)

Quite a young plant from Mr Rollinson &c

leaves pointed oval, alternate— almost horizontal, thickly covered above & below with white powdery matter— This is rubbed off with slightest touch—

In cold water beautifully silvery above & below & not in the least wetted— Ether removes it very quickly & leaves then well wetted.— 87° - 86° for 1m well wetted.

Waving in cold water (57°) for 30" does not wet them, except the rubbed part which was wetted

Waving for 1m in 76° - 75° wetted upper surface, but not lower surfaces; but upper surface not very perfectly wetted for by blowing hard portions were almost dried.—

(These leaves are not nearly so well protected as are cabbage & sea-kale, though living in a rather warm climate — viz Tasmania & though the bloom is more conspicuous or at least equally so)

(see separate account of old leaves Nov. 19th & the pulvinus experiments.)

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Eucalyptus globulus

1873 Nov. 19'

Fine branches sent me from Kew stuck in damp earth on 17th & so arrived pretty fresh. — Full-grown, but healthy leaves, waved in water at 52° for 30", very considerably wetted on both surfaces, yet not quite continuously, for margins rather dry.— When first put in appears finely silvery on both surfaces, but is spotted with water.— Quite A young leaf waved in the same manner in the same water for 30" much spotted all over. (Has the wax become less secreted because the leaf has become vertical? or has it become vertical because the wax has failed?) I tried several leaves, young & full full-grown & all more or less spotted, by being merely dipped into the water especially on the under surface by the cold water: I took the best leaf which was only slightly spotted by being quickly immersed & waved it for 30" & it was thickly spotted with water.

(The same best leaf waved for 30" in water 70°-69° was thoroughly wetted on both surfaces — So it was with water 68°-67°: so with a young leaf at 66°.— (over

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Even a very good leaf waved for only 15" in water at 60° had lower surface completely completely wetted & upper surface about half its area wetted with great splashes of water.— Repeated this experiment with the water at 60° with another leaf with the same result.

In fact there can only be said to be a rudiment or vestige of the wax on the vertical, large, unequally lobed, leaves of full-grown plants— I cannot believe that during heavy, even moderately warm rain the bloom can be any protection— The vertical position quite as good or better protection.— The surface of old leaves covered with little sphere of reddish brown excreted resinous substance. —

Hence It it may be doubted whether the secretion of the wax can cost the plant anything

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Eucalyptus globulus (young plant with horizontal leaves)

Dec' 5- 9° — Washed a leaf & rubbed with soft camel with water at 90° & so got off bloom & put on large drop of water.— (Washed leaf to left at tip & did not leave on water.)

Removed water on 7th 12° 10'— Greenhouse Cool— Hot House little warmer than Greenhouse— Evaporated water, I think more matter than can be accounted for by dust during 52°.— (Weather dull during whole 52°) time cloudy).

(Dec. 9. 3° P.m. no effect produced)

Dec. 9th 8° A.m. washed another young leaf & put on water (& Red wool) & left it all day.— sun shining so hot, that after long cloudy weather, that upper part of plant drooped—

Dec. 11th 12° no effect produced.

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Eucalyptus amygdalius na from Rollinson. (name?)

Except Leaves linear, many of them horizontal, or sub-vertical or vertical.— I can see no silvery appearance in water & yet after waving in w. & blown on most of the water is blown off. — Even after immersion for 1m 85° - 84° not much more wetted. After ether well wetted — After shaking in cold water for 30" & then violently shaking leaf some portions became dry. This same leaf was then shaken for few second in ether & then shaken for a few seconds in ether & now it was completely wetted. Hence I think there certainly is a trace of Waxen secretion. — shook another leaf for 30" in W 93° 92° wetted yet by hard blowing parts were made almost dry.— (I do not think hard blowing fair test.)

Dec. 5' 9°. I tried in Hothouse with moderately cold water & leaves just dipped & shaken in it, were all spotted with water.

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Eucalyptus amygdalina

Decr. 5th 9°— washed 2 leaves with water at 90° & put on drops of water, but the leaves are too narrow for them to stick well & washed a third & intermediate leaf & left on no water

Decr. 9th no effect, but the weather cloudy all time

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Eucalyptus

E. obliqua— young plant from Kew— leaves vertical, but of each alternate pair — one not so vertical as others — Old leaves perfectly wetted when dipped in water— the young leaves 1/2 & 3/4 grown are not so perfectly wetted, they seem so smooth that water does not readily adhere yet show no silver & have no true bloom.

Dec. 5th At 9°— washed rather young leaf with water 90° & put on large drop of pure water on leaf or board, & washed leaf immediately above it (an older leaf) but left on no water.—

Removed water on Dec. 7th 12° 10'; evaporated it, & I think more matter than can be accounted for by dust during the 52°.— (Weather dark all the time) (Plant in cool Hothouse, not much warmer than greenhouse.)

Dec. 9th no effect, but then weather whole time cloudy

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All Eucalyptus.

Eucalyptus

33 Leaves very large subvertical upper surface easily wetted— lower, rather less so, but leaves rather old.

This is E globulus of which I have given a very different description

Eucalyptus

17 Leaves sub vertical, large, upper surface easily wetted lower less o so— Wetted

Eucalyptus

18 Leaves with edges almost vertical a trace of silver on upper surface, yet easily wetted. Lower surface much better protected. Wetted