It was in a British literary magazine, Beeton's Christmas Annual, for 1887, that the novel "A Study in Scarlet" first appeared, featuring a new-to-the-public detective, Mr. Sherlock Holmes, and his friend and room-mate, Dr. John Watson, M.D. As Wikipedia tells us, he was fairly popular, enough so that a second novel followed about three years later - and then, in 1891, a series of short stories in The Strand Magazine secured the permanence and continuing popularity of the world's first consulting detective.
Sherlock Holmes, of course, remains wildly popular today - even if it is no longer necessarily through the original four novels and 56 short stories written by Sir Arthur Conan Doyle. But, with the arrival of December, 2012, it is worth marking the 125th anniversary of Holmes and Watson. May they continue to flourish!