It it not extreamly furprizing lO fee the aboveraention*d 
Figures incorporated in fach a hard matter > Some of them 
lying near the fuperficies of the Cryftal, and fome of em 
much deeper. 
I have a piece of Rock Cryftal that is Hexangular, and 
ending in an Hexangular pointy it is about a Fingerihick, 
and an Inch long ^ upon one fide of ir one could difcover 
with the naked Eye little cavities or holes, about the large- 
nefs of halt a Nail, the which cavities feem'd, for the moft 
part, to be fiird with an Earthy matter ^ but when I plac'd 
the faid Cryftal before my Microfcope, ray opinion of it 
was, that while the faid Cryftal was growing or coagula- 
ting, feveral fmall Infeds running about upon it, were 
irrctiated or imprifoned therein^ the rather becaufe that 
fome other Particles lay yet deeper in the Cryftal, and fo 
they were altogether ftiut up in the fame. The Bodies of 
thefe Infers or Worms were corapofed of very fmall and 
^lender Circles, or Ring-like parts, as I have obferved fre- 
quently in fuch Atiimalcula* 
I placed the faid piece of Cryftal before a Microrcope,and 
caufed the Painter to draw a fmall part of one of thefe 
feeming Infefts that lay pretty deep in the Chryftal, asjou 
may fee in Fig. 1 1. G H I K. 
I could fee no further of this Part, becaufe the ends 
thereof, viz. G and I, were covered with other fuch like 
Particles 5 and this was alfo «he largeft Body that I could 
difcover amorigft them, for the other Particles were broke 
into much fmaller bits and pieces. Amongft all thofe that 
I obferved, there was but one Particle that ended in a point, 
and that I judged to be a part of the Tail, as I guefled 
that another had been a Head 5 I faw alfo two fmall Par- 
ticles that had been alike green, and fo were feveral other 
little pieces of Infefts. 
I had two pieces of Cryftal, of which the fmalleft was 
above an inch thick and Hexangular, whereiii^I difcovcr'd 
feven long Particles, the largeft of which was no thicker 
than 
