Memoirs of Extraordinary Popular Ideas - Volume 2 by Charles McKay is a fascinating book that reveals important aspects of human psychology through the description of the most memorable mass superstitions and outbreaks of hysteria throughout history. The author investigates such phenomena as "Bulbosaurus" (stock market panic of 1840), "Black Hen" (belief in magical properties), "Eternal Lah" (popular fashion), revealing the deep mechanisms of mass hypnosis and acceptance of unreasonable ideas. This book is not only an interesting piece of literature, but also a study guide for the analysis of mass reactions and the identification of relationships between historical events and the psychology of society.