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The Etymologicon.
The English also used to believe that the Welsh were crazy for cheese. Grose’s Dictionary of the Vulgar Tongue (1811) records that:
The Welch are said to be so remarkably fond of cheese, that in cases of difficulty their midwives apply a piece of toasted cheese to the janua vita [gates of life] to attract and entice the young Taffy, who on smelling it makes most vigorous efforts to come forth.