Hypnotism: Magnetism, Mesmerism, Suggestive Therapeutics: Now Available!
This work is one of the better things that LW DeLaurence wrote. Containing fewer self-advertizements and a lot more how-to content, it dispels some myths about mesmerism and hypnotism, and proposes about a dozen methods by which various suggestive states can be induced- including the famous trick of hypnotizing a chicken using a chalk line or a finger (it apparently does indeed work.)
While some of the methods are now known not to function (at the time this was written- and it alludes to it explicitly!- the French were experimenting with spinning wheels and lights to induce anesthesia- one of the earliest- maybe THE earliest literary reference to this trope!) others are accepted even today. Some of its content would later be adapted into the 20s and 30s era "how to hypnotize your friends" style pulp works.