 Before leaving Geneva Boyle had a conversation with François Perreaud (1572–1657), who later wrote Démonographie, ou traité des démons, which Boyle then arranged to have translated into English by Peter du Moulin (the younger, 1601–1684). In a letter prefixed to the English edition Boyle recalled that “the conversation I had with that pious Author during my stay at Geneva, and the present he was pleased to make me of this Treatise before it was printed, in a place where I had opportunities to enquire both after the writer, and some passages of the booke, did at length overcome in me (as to this narrative) all my settled indisposedness to believe strange things.” (BW 1:15) Acceptance of at least the possibility of diabolic or angelic intervention was common among the intelligentsia in the second half of the seventeenth century. Cudworth pointed out one expedient reason for the belief: