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Letter 10982

Darwin, C. R. to Gray, Asa

4 June [1877]

    Summary Add

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    C. E. Bessey's case [see 10969] came too late, as the sheets had been printed, but CD thinks it should be carefully investigated as a possible case of incipient heterostyly.

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    Is trying to make out the function of "bloom", the waxy secretion on leaves and fruits.

Transcription

Down, | Beckenham, Kent. | Railway Station | Orpington. S.E.R.

June 4th

My dear Gray

Prof. Bessey's case has come too late for me, as the sheets on this subject are printed off. Nor indeed if it had come earlier, should I have known what to do with it. The pollen-grains & stigmas ought to be compared. The case seems to be well worth careful investigation & I wd. have given my eyes for seeds formerly; but now I have done with the subject. If Prof. Bessey likes experimental work he might raise seedlings & fertilise short & long pistils with pollen from long & short stamens from distinct plants & on the same plant: counting the proportion of flowers which set fruit, when fertilised in the various ways & the number of seeds per fruit. His diagram shows the nature & the difference between the flowers excellently. I will send him my book, when published in 4 or 5 weeks, & if he thinks it worth reading he can see how to experimentise on the plants.— The case may be one merely of great variability, but it may be one of incipient heterostylism; & under this point of view I would formerly (if I could) have investigated it most carefully.—

When you receive my little book, you will see that I have done an audacious deed with respect to you.—

I am now trying to make out the use or function of ``bloom'' or the waxy secretion on the leaves & fruits of plants, but am very doubtful whether I shall succeed.— Can you give me any light? Are such plants commoner in warm than in colder climates? I ask because I often walk out in heavy rain & the leaves of very few wild dicotyledons can be here seen with drops of water rolling off them like quicksilver. Whereas in my flower garden, greenhouse & hot-houses there are several. Again are bloom-protected plants common on your dry western plains; Hooker (Sir Joseph Hooker) thinks that they are common at the C. of Good Hope.— It is a puzzle to me if they are common under very dry climates, & I find bloom very common on the Acacias & Eucalypti of Australia. Some of the Eucalypti which do not appear to be covered with bloom have the epidermis protected by a layer of some substance which is dissolved in boiling alcohol.— Are there any bloom-protected leaves or fruit in the Arctic regions?— If you can illuminate me, as you so often have done, pray do so; but otherwise do not bother yourself by answering

Yours affecty | C. Darwin

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