ofBlcalt anU^ctDum* 9 



And when a knife , whofe blade is 

 touched with a Load-ftone 3 cuts 

 bread and takes up filings of Iron, it 

 does neither of them upon the fcore 

 of Alcdi and Acidum^ but the one up- 

 on the vifible (hape and the ftiffnefs 

 of the blade., and the other upon the 

 latentContrivance or change of Tex- 

 rure produced by the operation of 

 the Load-ftone in the particles that 

 compofe the Steel • 



This may perhaps be farther illu- 

 ftrated by adding, that when blew 

 Vitriol^ being beaten and finely fear* 

 ced, makes a white pouder, that 

 whitenefs is a quality which the pou- 

 der has not as being of a Vitriolate 

 Nature. For Rock-Cryftal or 

 Venice-glafs being finely beaten will 

 have the fame operation on the Eye, 

 but it proceeds from the tranfparen- 

 cy of the body and the minutenefs, 

 multitude and confus'd fcituation ot 

 the Corpufcles that make up the 

 Ponder. And therefore, if other bo* 

 dies be brought by Comminution in- 

 to parts endow'd with fuch Mechani- 

 cal 



