My dear Gray

Although I have nothing particular to say I must thank you for your pleasant letter of March 19^th.—² But let me say—I know what a busy man you are, & pray do not waste more time over me. My book, your Review, & letters &c &c must have consumed an awful amount. In one sense the time spent on Review has not been wasted; for I feel sure (& I have again (3^d time) read it all consecutively) that it will produce great effect, in leading people to think, & that is all I wish. Hooker indeed tells me he knows cases where your article has had this effect & has greatly mollified opposition to my Book.—   I agree largely to what you say about “vera causa” “theory”; “hypothesis”; indeed on reading your whole review in one read I saw that some of my remarks were rather superfluous.³

It is curious that I remember well time when the thought of the eye made me cold all over, but I have got over this stage of the complaint, & now small trifling particulars of structure often make me very uncomfortable. The sight of a feather in a peacock’s tail, whenever I gaze at it, makes me sick! Under this point of view your story of the Black Pigs in the Everglades delights me,⁴ & supports other cases, which though founded on very good evidence I could hardly digest.—

Pray keep Prof. Wyman up to the mark about writing to me; I sh^d, also, look at it a great honour & favour, If you possibly can find out name positively of the red nuts.—⁵

I shall be very curious to see Agassiz’s remarks:⁶ I met a few days ago Prof Cooke of your Cambridge⁷ & he brought me direct from Agassiz all sorts of very civil speeches. What can this mean? I hope to God A. is a sincere man; I had always fancied that he was so.—

You may like to hear about Reviews on my Book. Sedgwick (as I & Lyell feel certain from internal evidence) has reviewed me savagely & unfairly in the Spectator.⁸ The notice includes much abuse & is hardly fair in several respects. He would actually lead anyone, who was ignorant of geology, to suppose that I had invented the great gaps between successive geological formations; instead of its being an almost universally admitted dogma. But my dear old friend Sedgwick with his noble heart is old & is rabid with indignation.—   It is hard to please everyone; you may remember that in my last letter I asked you to leave out about the Weald denudation:⁹ I told Jukes this (who is head man of Irish geological survey) & he blamed me much for he believed every word of it, & thought it not at all exaggerated!¹⁰ In fact geologists have no means of gauging the infinitude of past time. There has been one prodigy of a Review, namely an opposed one by Pictet the palæontologist in the Bib. Univers. of Geneva,¹¹ which is perfectly fair & just & I agree to every word he says; our only difference being that he attaches less weight to argument in favour & more to argument opposed, than I do. Of all the opposed reviews I think this the only quite fair one, & I never expected to see one. Please observe that I do not class your Review by any means as opposed, though you think so yourself! it has done me much too good service ever to appear in that rank in my eyes. But I fear I shall weary you with so much about my Book. I sh^d rather think there was a good chance of my becoming the most egotistical man in all Europe.! What a proud preeminence!—   Well you have helped to make me so, & therefore you must forgive me if you can.—

My dear Gray | Ever yours most gratefully | C. Darwin

I posted letter to Vilmorin.¹²