Yours affectionately, CH. DARWIN. [In October he wrote Sir J.D. Hooker:-- "Talking of the 'Origin,' a Yankee has called my attention to a paper attached to Dr. Wells's famous 'Essay on Dew,' which was read in 1813 to the Royal Society, but not [then] printed, in which he applies most distinctly the principle of Natural Selection to the Races of Man. So poor old Patrick Matthew is not the first, and he cannot, or ought not, any longer to put on his title-pages, 'Discoverer of the principle of Natural Selection'!"] CHARLES DARWIN TO F.W. FARRAR. (Canon of Westminster.) Down, November 2 [1865?]. Dear Sir, As I have never studied the science of language, it may perhaps seem presumptuous, but I cannot resist the pleasure of telling you what interest and pleasure I have derived from hearing read aloud your volume ('Chapters on Language,' 1865.) I formerly read Max Muller, and thought his theory (if it deserves to be called so) both obscure and weak; and now, after hearing what you say, I feel sure that this is the case, and that your cause will ultimately triumph. My indirect interest in your book has been increased from Mr. Hensleigh Wedgwood, whom you often quote, being my brother-in-law. No one could dissent from my views on the modification of species with more courtesy than you do. But from the tenor of your mind I feel an entire and comfortable conviction (and which cannot possibly be disturbed) that if your studies led you to attend much to general questions in natural history you would come to the same conclusion that I have done. Have you ever read Huxley's little book of Lectures? I would gladly send a copy if you think you would read it. Considering what Geology teaches us, the argument from the supposed immutability of specific types seems to me much the same as if, in a nation which had no old writings, some wise old savage was to say that his language had never changed; but my metaphor is too long to fill up. Pray believe me, dear Sir, yours very sincerely obliged, C. DARWIN. 1866. [The year 1866 is given in my father's Diary in the following words:-- "Continued correcting chapters of 'Domestic Animals.' March 1st.--Began on 4th edition of 'Origin' of 1250 copies (received for it 238 pounds), making 7500 copies altogether. May 10th.--Finished 'Origin,' except revises, and began going over Chapter XIII. of 'Domestic Animals.' November 21st.--Finished 'Pangenesis.' December 21st.--Finished re-going over all chapters, and sent them to printers. December 22nd.--Began concluding chapter of book." He was in London on two occasions for a week at a time, staying with his brother, and for a few days (May 29th-June 2nd) in Surrey; for the rest of the year he was at Down. There seems to have been a gradual mending in his health; thus he wrote to Mr. Wallace (January 1866):--"My health is so far improved that I am able to work one or two hours a day." With respect to the 4th edition he wrote to Sir J.D. Hooker:--