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the muddinefs of it, and reduc’d toconform it self to whatever shape thecontiguous part of the Cavity cbanc’dto be of; whereasthe upper part of thestone was not only form'd of the clea-rer part of the Lapideseent Juice be-fore the waterifh vehicle was exhal’d ,but had room and opportunity to (hootinto the curious figure belonging to itsNature. And this is much more con-spicuous, where many of these Christalsgrow as it were in Clusters out of oneMineral Cake or Lump , as I have seennot only in those soft but yet transpa-rent Concretions, which some of thelater Mineralises ( for the ancient seemscarce to have known them) call finorcr,and particularly in a very fine minerallump,that I had once the honour to have(hew’d me by a great Prince,and no lessgreat a Virtuoso, to whom it was thennewly presented. For this mass consistedof two flat Parallel Cakes, that seem'dcompos’d of a dirty kind of Cristallinesubstance, and out of each Cake theregrew towards the other a great Num-ber of stones, some of which by their

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