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Letter 6896

Darwin, C. R. to Hooker, J. D.

18 [Sept 1869]

    Summary Add

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    Asks JDH to consult colleagues learned in physiology for answer to query: when a large piece of bark is removed from a tree, does the bark ever regrow in isolated points [separate] from the growing margin of the surrounding bark? Query bears on Pangenesis and on power of repair in plants.

Transcription

Down. | Beckenham | Kent. S.E.

18th

My dear Hooker

We shall all be right glad to see you this day week; let us know Trains to Orpington & in all probability we can send to meet you.—

I much want a query answered.— Consult any of your colleagues learned in physiology.— When a large piece of bark is removed from a tree, does the bark ever regrow in isolated points, separate from the growing margins of the surrounding bark. I fancy I have heard that this is sometimes the case.— It bears on Pangenesis & on little powers of repair by plants.

If you can answer in affirmative pray send me a line,—if I do not hear, I shall understand your answer is a negative—.

Yours affect, | C. Darwin

    Footnotes Add

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    f1 6896.f1
    The month and year are established by the relationship between this letter and the letter from J. D. Hooker, 24 September 1869.
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    f2 6896.f2
    CD discussed the regrowth of bark in his letter to Scientific Opinion, [before 20 October 1869], drawing an analogy with the regrowth of amputated limbs in some animals. CD added a section on the regrowth of amputated parts to his discussion of pangenesis in the second edition of Variation (Variation 2d ed., 2: 357--9), but did not discuss plants.
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