PAUL BOYER and STEPHEN NISSENBAUM, Salem possessed. The social origins of witchcraft, Cambridge, Mass., Harvard University Press, 1974, 8vo, pp. xxi, 231, illus., $10.00. Reviewed by Edwin Clarke, M.D., F.R.C.P., Wellcome Institute for the History of Medicine, 183 Euston Road, London NW] 2BP. Of all the outbreaks of witchcraft in the seventeenth century, that at Salem Village, Massachusetts, in...