is indeed an elderly Bohemian, who keeps a large general store. Holmes examines Edith's bedroom window, finding that the only way to climb up to it is using the creeper, unusual for a 61-year-old man. Holmes forms a theory that every 9 days, Professor Presbury takes some drug which causes the odd behaviour, having become addicted in Prague, and is supplied by Dorak in London. Holmes also comes to realise, by connecting the professor's thick and horny knuckles, his odd behaviour, the dog's attacks, and the use of the creeper, that the professor is behaving like a monkey. Shortly after the realisation, Holmes and Watson are treated to a firsthand display of Professor Presbury's odd behaviour. He comes out of the house, scampers about on all fours, climbs on the creeper, and torments the tied-up dog. Unfortunately, the wolfhound gets loose and attacks the professor. The two of them, with Mr Bennett's help, get the dog off the professor, who is wounded badly. Watson and Bennett, also a medical man, tend to the professor's injuries. Holmes then examines the professor's little wooden box after having obtained the key from the unconscious owner. It contained a drug, as Holmes expected, but also a letter from a man named Lowenstein, a quack. The professor had sought out Lowenstein's rejuvenation treatments due to his upcoming marriage to a younger woman. The drug's effects are explained as a consequence of being obtained from langurs. Promising to hold Lowenstein responsible, Holmes muses on the consequences of such drugs, and departs with Watson. Commentaries David Stuart Davies, who has written an afterword for the Case-Book, comments that this story "veers towards risible science fiction". Indeed, there is something a bit less scientific in this story than is usually the case with Conan Doyle's writing. This is one of four stories said to be forged "drivel" in Nicholas Meyer's 1974 novel The Seven-Per-Cent Solution. (The other three are also from The Case-Book of Sherlock Holmes.) Ancient philosophy scholar Jonathan Barnes writes of encountering the story as a child and finding it "one of the richest and most singular investigations of Holmes's long career – an opinion which I have had no reason to change ... Revisited in adulthood, the story reveals itself as a sour parable about the endurance of lust, a lurid treatment of the question that is put to Falstaff as Doll Tearsheet fidgets on