Note 1091 — Chapter LI
Reading edition
Berthelot (1893) II, 74 and 77; Lippmann (1919) 481. I doubt if there is much ground for their further assertion that such clerics fell easily under suspicion of heresy and hence wrote in ciphers like Roger Bacon’s for gunpowder. At p. 688 I have refuted the notion that Bacon employed a cipher to conceal the recipe for gunpowder.