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ON THERAPEUTIC USES OP STONES           389
The proper method of applying a sapphire to cure plague boils is given at some length by Von Helmont. A gem of a fine, deep color was to be selected and rubbed gently and slowly around the pestilential tumor. During and immediately after this operation, the patient would feel but little alleviation; but a good while after the re­moval of the stone, favorable symptoms would appear, provided the malady were not too far advanced. This Von Helmont attributes to a magnetic force in the sap­phire by means of which the absent gem continued to extract "the pestilential virulency and contagious poyson from the infected part."42
The use of a topaz to cure dimness of vision is strongly recommended by St. Hildegard. To attain the desired end the stone was to be placed in wine and left there for three days and three nights. When retiring to sleep, the patient should rub his eyes with the moistened topaz, so that this moisture lightly touched the eyeball. After the stone had been removed, the wine could be used for five days.43
A Roman physician of the fifteenth century was re­puted to have wrought many wonderful cures of those stricken by the plague, through touching the plague sores with a topaz which had belonged to two popes, Clement VI and Gregory II. The fact that this particular topaz had been in the hands of two supreme pontiffs must have added much to the faith reposed in the curative powers
" " A Ternary of Paradoxes, written originally by Joh. Bapt. Van Helmont and translated, illustrated, and amplieated by Walter Charle-ton," London, 1650, p. 17.
" S. Hildegardae, "Opera omnia," in Pat. Lat. ed. by J. P. Migne, vol. excvii, Parisiis, 1855, col. 1255.