To John Lubbock 21 [March 1859]1
I return Linn. Trans. with thanks & I send all the Med. Times with articles on Crustacea.—2
If Sir John has the Report Brit. Assoc. for 1839 (Birmingham Meeting) & would lend it me for a few days, I shd. be much obliged; if I do not receive it, I shall understand you have it not.—3
I have looked carefully at Huxley’s Plates of young Aphis but have not read Text to spare my brain.—4 My impression is that in “germ” Pl. 37 fig. 6. there is nothing that can be called an apodal Vermiform body, but a body already divided into abdomen, thorax with great head. In next plate, in “embryo” we see even proportions indicated in length of antennæ, small Trophi & broad short legs, & other segments not at all developed; so that here there seems to me no Vermiform stage.
I wish you would look at Plates, & if you come to any decision one way or other tell me, but not write otherwise for form sake.— My impression would have been, had you not taken a contrary one, that Aphis was case of insect being developed into its pupa form, as soon as anything could be detected, without passing through the vermiform stage common to other insects.—5
Thanks for Wollastons letter, which I have been glad to see. Till one hears how all facts stand on species of Madeira & Canaries, one can form no opinion: I know it would take a powerful deal of evidence to make me believe they had ever been continuously united.— I sent our joint letter to Madeira, & I fear Wollaston will not get it—6
Farewell | Yours most truly | C. Darwin
I forgot to ask about Railway to Farnborough.—7
P.S | I see I was blundering about homologies of young cirripedes.— The only point I made out at all clearly is that 3 pair of natatory organs in youngest stage are not antennæ: the rest seems all speculative.8 Proteolepas Cryptophialus are important for homologies of Cirripedes.—9
Development of aphids; apparent absence of vermiform stage.
Please cite as
Darwin Correspondence Project, “Letter no. 2419,” accessed on 26 April 2017, http://www.darwinproject.ac.uk/DCP-LETT-2419