To Leonard Jenyns 13 November 
Wells Terrace | Ilkley, Otley | Yorkshire
My dear Jenyns
I must thank you for your very kind note forwarded to me from Down.—1 I have been much out of health this summer & have been hydropathising here, for last six weeks with very little good as yet.— I shall stay here for another fortnight at least.
Please remember that my Book is only an abstract & very much condensed & to be at all intelligible must be carefully read. I shall be very grateful for any criticisms. But I know perfectly well that you will not at all agree with the lengths which I go.2 It took long years to convert me.— I may of course be egregiously wrong; but I cannot persuade myself that a theory which explains (as I think it certainly does) several large classes of facts, can be wholly wrong; notwithstanding the several difficulties which have to be surmounted somehow, & which stagger me even to this day.
I wish that my health had allowed me to publish in extenso; if I ever get strong enough I will do so, as the greater part is written out, & of which M.S. the present volume is an abstract.—
I fear this note will be almost illegible; but I am poorly & can hardly sit up.
Farewell with thanks for your kind note & pleasant remembrances of good old days | Yours very sincerely | C. Darwin
Invites criticisms of his book [Origin] which is "only an abstract & very much condensed". Knows LJ will not agree with the lengths to which CD goes. It took long years to convert CD, but he cannot persuade himself "that a theory which explains … several large classes of facts, can be wholly wrong".
Hopes to publish his full MS if he ever gets strong enough.
Please cite as
Darwin Correspondence Project, “Letter no. 2528,” accessed on 30 April 2016, http://www.darwinproject.ac.uk/DCP-LETT-2528