To B. D. Walsh 24 December 
Down. | Bromley. | Kent. S.E.
My dear Sir
A copy of the Origin for you was sent on Aug 6 through Sampson Low to Scribner & Co New York;1 but as this copy is lost I have now ordered a new one to be sent to Messrs Bailliére New York for you.2 I am sorry that the first copy failed.
I have recd 2 numbers of the Practical Entomol.; the first about naturalized insects interested me greatly, & seemed very well done.3
I am rather sorry that you are Editor, as I have always heard that an Editor’s life is one of ceasless trouble & anxiety.4
I believe the reproduction of the Ornithorhyncus is not yet thoroughly known, & recently one little bit of evidence rather favours its being oviparous.5
I will send your proposal from Dr Velie to Dr Sclater Sec. Zoolog. Soc., as he is our greatest ornithologist.6
With respect to Aphis you must not trust my recollection, but Balbiani has shewn that the so-called pseudo-ovum contains a peculiar cell, & this so far is certain.7 Lubbock finds the same in Coccus.8 Now this cell according to B. contains spermatic matter & fertilises the other part of the pseudo-ovum.— I have asked 2 or 3 good judges & no one knows what to think, but all agree that B. is an excellent observer. According to this view the viviparous Aphides are all hermaphrodites with the 2 sexual elements in close union, & the oviparous Aphides unisexual.9
I shall be glad to receive your paper on galls—10
I am tired & not well today—so no more—
Yours very sincerely | Ch. Darwin
Balbiani’s puzzling observations on Aphis.
- Letter no.
- Darwin, C. R.
- Walsh, B. D.
- Sent from
- Source of text
- Field Museum of Natural History, Chicago (Walsh 8)
- Physical description
Please cite as
Darwin Correspondence Project, “Letter no. 5320,” accessed on 25 April 2017, http://www.darwinproject.ac.uk/DCP-LETT-5320