To George Henslow 15 [June 1866]1
Down. | Bromley. | Kent. S.E.
My dear Mr Henslow.
I do most strongly believe in Reversion. There can be no shadow of doubt both in uncrossed & in crossed varieties.— I have seen many instances.2
The evidence of Kölreuter & Gärtner is distinct for Hybrids, & some of Naudin’s cases leave no doubt whatever in my mind.—3 I have been writing a chapter on subject, & the cases of Reversion in ordinary Hybrids appeared so clear that I have not thought it worth while to give instances, only references.4 So that I have discussed only more curious cases. Think over that of Cytisus adami—5
I had forgotten whether Herbert gave cases.6 But I know that he believed to largest extent in Reversion, as I remember in conversation7 & as I think is stated in his remarks on stripes in Asses & Horses—8 but this latter case does not concern you, as it does not refer to Hybrids.— I fully believe that Gärtner is right when he says that Reversion occurs only rarely in hybrids made from plants, which have not been cultivated 9 Hence wide difference in Wichura’s & Naudin’s results.—10
Your’s very sincerely | Ch. Darwin
CD believes most strongly in reversion. J. G. Kölreuter’s, K. F. v Gärtner’s, and some of Charles Naudin’s cases leave no doubt in his mind. Forgets whether Herbert gave cases but in conversation he certainly believed in it. Thinks Gärtner is right to say reversion occurs only rarely in plant hybrids which have not been cultivated. [See 5120.]
- Letter no.
- Darwin, C. R.
- Henslow, George
- Sent from
- Source of text
- DAR Library: tipped into George Henslow’s copy of Variation
- Physical description
Please cite as
Darwin Correspondence Project, “Letter no. 5123A,” accessed on 8 December 2016, http://www.darwinproject.ac.uk/DCP-LETT-5123A