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ON THERAPEUTIC USES OF STONES         371
regarded as especially appropriate for use in ecclesias­tical rings. Among purple stones, the amethyst is par­ticularly noteworthy. The well-known belief that this gem counteracted the effects of undue indulgence in in­toxicating beverages is indicated by its name, derived from μεβύω — " to be intoxicated," and the privative a, the name thus signifying the "sobering" gem. It is not unlikely that a fancied resemblance between the pre­vailing hue of these stones and that of certain kinds of wine first gave rise to the name and to the idea of the peculiar virtues of the amethyst.
We have mentioned only a few of the more obvious analogies suggested by the color of gems, and we might be tempted to cite many others were it not that symbolism is always treacherous ground, since there is practically no limit to the correspondences that may be found be­tween sensuous impressions and ideas.
One great difficulty which besets any one who is try­ing to find a clue to guide him through the labyrinth of the medical affinities of gems is the fact that there was, from an early period, a tendency to attribute the virtues of one gem to another, probably owing to the commercial instinct which urged the dealer to praise his wares in every possible way, so that no part of his stock should fail to find a purchaser. This tendency is especially marked in the old Hindu Lapidaries, wherein it is almost impossible to find any differentiation of the stones in respect to their curative or talismanic virtues. Only the condition and perfection of the gems are made the cri­terion of their worth. Any given stone, if perfect, was a source of all blessings to the wearer and possessed all remedial powers, while a defective stone, or one lacking the proper lustre or color, was destined to be a source of untold misfortune to the owner.