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mid-Victorian stories and beliefs
Susan Hoyle

presumptive test for blood using guaiac, a West Indian shrub, but the discovery a year later of Schönbein’s hydrogen peroxide test seems to have carried the day. Stewart may have used Van Deen’s guaiac test, although hydrogen peroxide was probably easier to find in Stratford-upon-Avon. See ‘Forensic Science Timeline’ ( Timeline.htm); Keith Inman and Norah Rudin, Principles and Practice of

in Witchcraft Continued