#OTD in 1879.
Arthur Conan Doyle has his first story, "The Mystery of Sasassa Valley", published anonymously in Chambers's Edinburgh Journal.
https://en.wikipedia.org/wiki/The_Mystery_of_Sasassa_Valley
The Mystery of Sasassa Valley at PG:
https://www.gutenberg.org/ebooks/69260
Books in Chambers's Edinburgh Journal at PG:
https://www.gutenberg.org/ebooks/bookshelf/210