COMMENT:A sequel to <a href="/bib/44"><cite>Extraordinary Popular Delusions And The Madness Of Crowds</cite></a>, which includes some of the history of MacKay's book through multiple printings. Chapters are Ponzi and Company, The Florida Land Boom, The Tulipmania Revisited, Invaders from Mars and Bat-Men on the Moon, The Destruction of the Xhosas, Soccer, Lotteries, Dowsing, Perpetual Motion, Musical Madness, Jonestown and Other Cults, and War: The Ultimate Delusion.