My dear Carpenter

I must thank you for your letter on my own account & if I know myself, still more warmly for the subject sake.² As you seem to have understood my last chapter without reading the previous chapters, you must have maturely & most profoundly self-thought out the subject; for I have found the most extraordinary difficulty in making even able men understand at what I was driving.

There will be strong opposition to my views. If I am in the main right (of course including partial errors unseen by me) the admission of my views will depend far more on men, like yourself, with well established reputations, than on my own writings. Therefore, on the supposition that when you have read my volume you think the view in the main true, I thank & honour you for being willing to run the chance of unpopularity by advocating the view. I know not in the least whether anyone will review me in any of the Reviews. I do not see how an author could enquire or interfere: but if you are willing to review me anywhere, I am sure from the admiration which I have long felt & expressed for your Comparative Physiology,³ that your review will be excellently done & will do good service in the cause for which I think I am not selfishly, deeply interested.⁴

I am feeling very unwell today & this note is badly, perhaps hardly intelligibly expressed; but you must excuse me; for I could not let a Post pass, without thanking you for your note. You will have the tough job even to shake in slightest degree Sir H. Holland. I do not think (privately I say it) that the great man has knowledge enough to enter on subject.—⁵

Pray believe me, with sincerity, Yours truly obliged | C. Darwin

As you are not a practical geologist, let me add that Lyell thinks the chapt. on the Imperfection of the Geological Record not exaggerated.—