Giovanni Boccaccio, The Decameron (Payne) — Novel 9… (1886)
“ The young woman marvelled, but believed his tale and told her husband, saying, 'If he is so much thy friend as thou sayest, why dost thou not make him teach thee his charm, so thou mayst avail to make of me a mare and do thine affairs with the ass and the mare? So should we gain two for one; and when we were back at home, thou couldst make me a woman again, as I am.' Pietro, who was somewhat dull of wit, believed what she said and falling in with her counsel, began, as best he knew, to importune Dom Gianni to teach him the trick. ”
