Many thanks for your offer to look after horses' stripes; if there are any donkeys', pray add them. I am delighted to hear that you have collected bees' combs; when next in London I will inquire of F. Smith and Mr. Saunders. This is an especial hobby of mine, and I think I can throw light on the subject. If you can collect duplicates at no very great expense, I should be glad of specimens for myself, with some bees of each kind. Young growing and irregular combs, and those which have not had pupæ, are most valuable for measurements and examination; their edges should be well protected against abrasion. Everyone whom I have seen has thought your paper very well written and interesting. It puts my extracts (written in 1839, now just twenty years ago!), which I must say in apology were never for an instant intended for publication, in the shade. You ask about Lyell's frame of mind. I think he is somewhat staggered, but does not give in, and speaks with horror often to me of what a thing it would be and what a job it would be for the next edition of the Principles if he were "perverted." But he is most candid and honest, and I think will end by being perverted. Dr. Hooker has become almost as heterodox as you or I--and I look at Hooker as _by far_ the most capable judge in Europe. Most cordially do I wish you health and entire success in all your pursuits; and God knows, if admirable zeal and energy deserve success, most amply do you deserve it. I look at my own career as nearly run out; if I can publish my abstract, and perhaps my greater work on the same subject, I shall look at my course as done.--Believe me, my dear Sir, yours very sincerely, C. DARWIN. * * * * * LETTER IV C. DARWIN TO A.R. WALLACE _Down, Bromley, Kent. April 6, 1859._ My dear Mr. Wallace,--I this morning received your pleasant and friendly note of Nov. 30th. The first part of my MS.[30] is in Murray's hands, to see if he likes to publish it. There is no Preface, but a short Introduction, which must be read by everyone who reads my book. The second paragraph in the Introduction[31] I have had copied _verbatim_ from my foul copy, and you will, I hope, think that I have fairly noticed your papers in the _Linnean Transactions_.[32] You must remember that I am now publishing only an Abstract, and I give no references. I shall of course allude to your paper on Distribution;[33] and I have added that I know from correspondence that your explanation of your law is the same as that which I offer. You are right, that I came to the conclusion that Selection was the principle of change from study of domesticated productions; and then reading Malthus I saw at once how to apply this principle. Geographical distribution and geographical relations of extinct to recent inhabitants of South America first led me to the subject. Especially the case of the Galapagos Islands.