Lycanthropes--shape shifters

An occult book on lycanthropes--shapeshifters. This is likely either Lycanthropy: Lore and Law, or Chapter 3. Lycanthropy: The Ways of the Wolf All three may be the same book.

Background
The book claims that lycanthropy is not uncommon. Supposely, there's been evidence of apparently-normal human beings turning into various beasts throughout history, including some famous trials from the Middle Ages.