ly, if not briskly, and I uſually wear a Cornelian Ring, that is richly enough endowed with Electricity. But as for Emralds as I thought it ſtrange that Nature ſhould have denied them a Quality ſhe has granted to ſo many other Diaphanous Gems, and even to Cryftal, ſo I thought the aſſertion deſerved an Examen, upon which I concluded, that at leaſt it does not univerſally and conſtantly hold true. I had indeed ſeen in a Ring a Stone of price and great luſtre, which, though green, I found to be, (as I gueſs'd it would prove) vigorouſly enough Electrical. But this Experiment, though ſeemingly concluſive, I did not look upon as a fair trial, becauſe the Stone was not a true Emrald, but, which is rare, a green Saphir. And I learned by inquiry of the skillful Jeweller that cut it, that it was ſo far from having the ſoftneſs of an Emrald, that he found it harder than blew Saphyrs themſelves, which yet are Gems of great hardneſs, and by ſome reputed ſecond to none, but Diamonds. Without therefore concluding any thing from this Experiment, ſave that, if the aſſertion I was to examin were true, the want of an Electrical faculty might be thought a Concomitant rather of the peculiar Texture of the Emrald than of its green colour, I proceeded
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