This classic work of social psychology explores the phenomenon of mass hysteria and irrational behavior in history. Written by Charles Mackay in the 19th century, this book examines cases of delusions, panics, and crazes throughout history, such as the South Sea Bubble, the Crusades, and the Salem Witch Trials. Mackay's insights into the psychology of crowds and the power of collective belief are as relevant today as ever, making this book a must-read for anyone interested in the intersection of psychology and history. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.