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INTRODUCTION 27 well suited for what was almost certainly their object, namely, the ringing of the sanctus bell by the altar -clerk to warn outsiders of the Holy Mysteries. Cornwall has not manv of these Passage-Squint, St. Mawgan-in-Mencage windows. Whatever may have been their object, the intelligent ecclesiologist will always set his face sternly against the leper theory, a modern fancy based on a foolish conceit. 1 Lepers were forbidden 1 See Some Popular Archccological Errors and Fictions {Anti- quary, vol. xxx. 48-54).