If I do not pour out my admiration of your article on Koelliker, I shall explode. I never read anything better done. I had much wished his article answered, and indeed thought of doing so myself, so that I considered several points. You have hit on all, and on some in addition, and oh, by Jove, how well you have done it! As I read on and came to point after point on which I had thought, I could not help jeering and scoffing at myself, to see how infinitely better you had done it than I could have done. Well, if any one who does not understand Natural Selection will read this, he will be a blockhead if it is not as clear as daylight. Old Flourens was hardly worth the powder and shot; but how capitally you bring in about the Academician, and your metaphor of the sea-sand is _inimitable_. It is a marvel to me how you can resist becoming a regular reviewer. Well, I have exploded now, and it has done me a deal of good. C. DARWIN TO E. RAY LANKESTER DOWN, March 15th [1870]. _My Dear Sir:_ I do not know whether you will consider me a very troublesome man, but I have just finished your book, and cannot resist telling you how the whole has much interested me. No doubt, as you say, there must be much speculation on such a subject, and certain results cannot be reached; but all your views are highly suggestive, and to my mind that is high praise. I have been all the more interested, as I am now writing on closely allied though not quite identical points. I was pleased to see you refer to my much despised child, 'Pangenesis,' who I think will some day, under some better nurse, turn out a fine stripling. It has also pleased me to see how thoroughly you appreciate (and I do not think that this is general with the men of science) H. Spencer; I suspect that hereafter he will be looked at as by far the greatest living philosopher in England; perhaps equal to any that have lived. But I have no business to trouble you with my notions. With sincere thanks for the interest which your work has given me, I remain, yours very faithfully, CH. DARWIN. FROM A LETTER TO J.D. HOOKER CLIFF COTTAGE, BOURNEMOUTH, September 26th, 1862. _My Dear Hooker:_