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SUMMARY.                                    287
Onyx, the Sardonyx, and the Bloodstone) for personal wear, of a continued sort, and for other such outward uses next the skin as may be found feasible, convenient, and pleasant. In these cases also a variation of the jewelry chosen for wear may be sometimes made to the compound gems (of both silica, and alumina), to wit,—the true Emerald, and the true Topaz.
And we would by no means overlook the additional virtues, and properties ascribed of old, to, or assumed later on for, the Precious Stones as considered by us, whether traditionally, or speculatively, in the body of this our book. The probabilities may be fairly taken for granted that grounds, more or less valid, and trust­worthy, warrant a belief in the premises adduced, as well as in the practices empirically commended. Quoting again Mr. Boyle's Experimental Philosofhie (1675), he bids us " not prsetermit among the proofs of the efficacy of appended remedies those memorable examples which are deliver'd by the judicious Boetius de Boot, 1630, concerning the virtues of that sort of remedies."
" The employment of Precious Stones for medicinal purposes," wrote De Boot, " originated from an Arabian belief which held that they are the mystic residence of spirits." They were first worn as amulets; then gradually came to be given internally.
A certain stone (of Laurentian gneiss) greenish-yellow of hue, is found in the Island of Iona, one of the Hebrides, on the Western Coast of Scotland, where Columba founded his first monastery, 563 a.d. To amulets made from this kind of stone is attributed, even now, a power of protecting their wearers from all danger by drowning. Small crosses, finger-rings,