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Stones of Healing: Laet

Johannes de Laet was much impressed with the virtues of the lapis nephriticus as were most of his learned contemporaries, since he assures his readers that an oblong, smooth, moderately thick stone in his possession, having the color of honey and a very oily surface, had given his wife great relief from the severe pains caused by renal calculus, when the stone was bound upon her wrist. This particular specimen he sent a few years later to his Danish friend, Ole Worms, for the latter's cabinet of natural history. De Laet writes that all the virtues claimed for nephrite by Monardes in 1574, were observable in his specimen.

As late as 1726, there were some who retained faith in the curative power of jade, for a record of that date informs us that the traveller Paul Lucas had just come back to Paris from the Orient, and had brought with him a specimen of the lapis nephriticus which he intended to have cut up into thin slabs to bestow upon such of his friends as were suffering from gravel or calculus, or similar troubles.