Transactions of the Second International Folk-Congress (1892)
“ But although the slippers are nearly everywhere of a substance brilliant and hard, they are very rarely formed of glass; and the glass slipper has been proposed as a test of Perrault's influence over traditional versions of the story. [12] Miss Marian Roalfe Cox, who has examined and tabulated more than a hundred and fifty variants of Cinderella, informs me that only in three instances besides Perrault's does the glass slipper appear. Of these instances two are Scottish, one from the island of South Uist, the other from the neighbourhood of Glasgow, and the third is an Irish tale from Tralee. ”
