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220         THE MAGIC OF JEWELS AND CHARMS
upon they were driven to make use of human gravel, and found to their astonishment that this was an even more excel­lent sudorific than the bezoar itself.35
Although there is no direct relation between bezoars and the hair-balls sometimes found in the stomach or intestines
of human beings, there is some slight analogy, as the animal bezoar concretions seem to have been formed about a nucleus consisting of some indigestible material that has been swal­lowed by an animal. From the report of hospital surgeons, it appears that these hair-balls, which result from a long-
" S. de Vries, " Curieuse Aenmerkingen der byzonderste Oost en West-Indische Verwonderens-waerdige Dingen," Utrecht, 1682, Pt. II, pp. 912, 913.