( IPM ) 
wry tranfparent ^ and whereas a great many Salt Particles 
are fo foft, that m moift Weather they are diflblv'd into a 
Watry Vapour, thefe werefo hard and fo dry likcwife, as 
if they had been the Salts ot Chalk 5, and if one (hook the 
Glafs in which they were, they came off from it, efpeci- 
ally thofe Salt Particles that were pretty large. 
After thefe Obfervations I took another View , by the 
help of a Microfcope, of feveral pieces of ray Mountain or 
Rock Gryftal, juft as J had ^roke it off from the Stone, 
in which I had formerly dilc^over'd, amongft others, fome 
fiich figures as are defcrib'd in Fig. 5, between T U 3 and 
now obferving again an Hexangular piece of Cryftal which 
ended alfo in a point of the like (bape, I difcover'd in the 
fame feveral pointed blue fmali Cryflrals, as you fee hi Fig. 
9. between G and D. They were of Teveral fizes^ and 
fome of them a finer blue than the reft* 
I alfo difcoverd in another piece of Cryftal much the 
like Figure, but none of them were blue, fbrae of which 
were as tranfparent as Cryftal, and the others again as dark 
as if they had been nothing but a blackiOi Earth ^ fome of 
them lay much <ieeper in the Cryftal than the others. 
I had one piece of Cryftal, in which F counted above 
30 little blue Figures, fuch as are defcrib'd by Fig. 9. and 
tome of them fo very fmall, that they appeared no larger 
thro a Microfcope than a grain of courfe of Sand to tlie 
naked Eye 5 and as far as I could judge of \m, they were 
moft of them Hexangular^ but I obfcrvM, that iome of 
them were not fo per fed and regular as the reft, one point 
of them being bigger than the others, as they arcdefcrib'd^ 
in Fig, 10. between E F. 
I law alfo one little Figure lying, that was exaSly oi 
equal fides, but the fore-fides thereof ran obliquely, and 
the fuperficies of the fame did alfo confift of an exaft qua- 
dralateral Figure ^ it was moreover as bright as Cryftal, ap- 
pearing juft like one of thofe Diamonds of th:^ ordinary ■ 
fort, which we call thick Stones. 
U 
