In February 1651, a stream of townspeople in Springfield, Mass., filed into the home of magistrate William Pynchon to report unsettling occurrences. A pudding of offal and oats had spoiled for no reason. A woman experienced agonizing pain shortly before childbirth. A piece of salt beef tongue vanished; a missing set of knives reappeared. Pynchon duly recorded these events in a book of testimony that ran to dozens of pages.