One chapter that particularly interested me was Doyle's take on short stories. He was himself a master of the short story in its detective story form, and also wrote a few interesting other pieces of short fiction ("The Horror of the Heights" is a pretty gd Cthulhu Mythos precursor-tale, while "Danger!" dramatizes England's vulnerability to unrestricted submarine warfare in the years leading up to The Great War.
Of them all, it's Poe Doyle admires the most,* calling him "the master of all . . . Poe is, to my mind, the supreme original short story writer of all time . . . the world's supreme short story writer." As he goes along, Doyle singles out his favorites, his "list of masterpieces", which turns out to have a strongly weird-tales bent. Here are the stories Doyle includes in his listing:
Poe: The Gold Bug
Poe: The Murder (sic) in the Rue Morgue
Bret Harte: The Luck of Roaring Camp
Bret Harte: Tennessee's Partner
Stevenson: Dr. Jekyll and Mr. Hyde
Stevenson: The Pavilion on the Links
Kipling: The Drums of the Fore and Aft
Kipling: The Man who Would be King
Bulwer Lytton: Haunted and the Haunters
[anon; Blackwoods Magazine]: Metempsychosis
Grant Allen: The Reverend John Creedy
Quiller-Couch: Old Aeson
Maupassant: La Horda
Bierce: In the Midst of Life
All in all, I found it surprising how many of these might be considered horror stories, or at least weird tales. There are obvious omissions -- for example, he dismisses Hawthorne, saying that he always preferred his son Julian's work. A few are now considered classics (the Poe, Bierce, Jekyll & Hyde), while others I'd never heard of ("The Pavillion on the Links", "The Reverend John Creedy", "The Drums of the Fore and Aft"). After having read the whole book, despite some points of agreement I'm dubious that I'll find Doyle a guide to my tastes, but nonetheless I may at some point track down some of the short stories he praised and give them a read.
So, if anyone wants to put out a 'Doyle's Favorite (Weird) Tales', like the several Lovecraft's Favorites volumes from a few years back, the raw material is ready to hand.
*not surprising, given that Doyle's most famous work, the Sherlock Holmes series, derives directly from Poe's work.