The book How to Hypnotize by J. B. Morgan is a practical guide to the art of hypnotism, focusing on its application for entertainment and personal development. Written in the early 20th century, it provides step-by-step instructions on how to induce hypnosis, including methods for self-hypnosis and hypnotizing others. The book emphasizes the importance of confidence, concentration, and the power of suggestion in achieving successful hypnosis.