DOYLE, Arthur Conan (1859-1930). Autograph letter signed (?ACD?), 11 November 1891.1-page, 8vo, on bifolium, old folds. Written only a few months after Doyle?s most famous story, The Adventures of Sherlock Holmes, which was published for the first time in the Strand Magazine. Perhaps writing to a Dr. Vernon Ford, addressed here as ?Ford?, who Conan Doyle worked under while learning ophthalmic techniques at the Portsmouth Eye and Ear Hospital. He returned to London as a practicing ophthalmologist in the spring of 1891. The Sherlock stories published that year earned Conan Doyle more money in April 1891 than 6 months of income in Portsmouth, where he wrote his first two Sherlock Stories - A Study in Scarlet (1887) and The Sign of Four (1890).[With:] 1 ALS dictated in a secretarial hand (probably by A.H. Wood), 2pp., 27 June 1906 to Robert Barr (1849-1912). Barr was a Scottish-Canadian writer and friend of Conan Doyle.