Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 188.
Northern Husbandry, 20/09/1732, ¶1094:
There are various lunatics in the asylum at KRONOBY, some of them insane with jealousy about their wives. One, with an utterly ancient wife, even imagined he could see her going with another man. Perhaps impotence or possibly intercourse in his imagination could be the cause of this?