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Letter 2434

Darwin, C. R. to Lubbock, John

16 [Mar? 1859]

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    Wants JL's opinion on paper by L. J. M. Dufour ["Études anatomiques sur les insectes diptères de la famille des pupipares", C. R. Hebd. Acad. Sci. 19 (1844): 1345–55].




Dear Lubbock

Very many thanks for your most useful note: I was quite in error about aphis.—

I shall be most truly glad to see you on Saturday if you are able to come.— If I shd turn bad in time to let you know, I would send down, but I hope I may not.—

I have stumbled on one of my M.S. reference to paper of L. Dufour, in Annal des Sc. (3d series) Tom 3. p. 79, in which he says, (if I have not misunderstood him) that in certain degraded Diptera, the ovarian vesicle assumes the shape “ebauche”, in the ovary, of the pupa:—(p. 87) “at no time assumes the form of larva”.—

Would you be so very kind as to look at this paper, & give me your opinion when we meet on Saturday.

Yours very truly | C. Darwin

    Footnotes Add

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    f1 2434.f1
    Dated by the relationship to the letter from John Lubbock, 15 March 1859.
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    f2 2434.f2
    CD nevertheless remained doubtful about this point: see following letter and n. 5.
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    f3 2434.f3
    The ‘M.S. reference’ was a note CD had written for the chapter in his species book on laws of variation. It is transcribed in an appendix to Natural selection, pp. 573–4. In Dufour 1845, p. 79, Léon Jean Marie Dufour had stated: ‘Je répète donc que les Pupipares … ne produisent pas un véritable oeuf. Du moins la vésicule ovarienne prend dans l'ovaire même les traits ébauchés de la pupe. J'ai donc cru prudent, en parlant du premier produit de la conception, de préférer le nom d'embryon.’
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