Page:Experimentsnotes00boyl.pdf/589

Rh the particulars above recited (epecially concerning the interet of the weather, &c. in Electrical Ph&aelig;nomena.) But now I hall add, that not onely there may happen ome variations in the ucces of Trials made with Electrical Bodies, but that it is not o certain as many think, whether ome particular Bodies be or be not Electrical. For the inquiitive Kircherus reckons Crytall among thoe Gems to whom Nature has denyed the attractive power we are peaking of; and yet I remember not, that, among all the trials I have made with native Crytall, I have found any that was detitute of the power he refues them. Alo a late mot learned Writer reciting the Electricks, reckon'd up by our indutrious Countryman Gilbert, and increaing their number by ome oberved by himelf, (to which I hall now add, beides white Saphyrs, and white English Amethyts, the almot Diaphanous par of Lead Ore) denies Electricity to a couple of tranparent Gems, the Cornelion and the Emrald. And I do the les wonder he hould do o to the former, becaue I have my elf in vain tried to make any attraction with a piece of Cornelion o large and fair, that 'twas kept for a rarity; and yet with divers other fine Cornelions I have been able to attract ome light bodies very manifet- ly,