( 48 ? ) 
mond« were furrounded, in order to its own /vccreftion 
or Coalition therewith, but this Coagulating Adamantine 
Matter wou’d involve Earth, Sand, or whatever other 
'Particles lay in its way, by which means there would be 
no fuch Thing as a dear and clean Diamond digg’d out 
of the Earth. 
I know that there are fomerufFDiamonds in and about 
which there is an earthy Matter, but that does not feem 
ftrange to me, becaufe it happens, as I imagine, in the 
very Coagulation of the Diamonds, and when the Parts 
thereof were foft. 
Among feveral Hexangular Pieces of Rock-Chryftal, 
I have obferved feme whofe fides appear’d very fmooth 
to the naked Eye, and whofe Points did not at all re- 
Temble Chryftal, but rather a dark Earth 5 which I con- 
ceive to be only occafion’d by the neighbouring Earth’s 
infinuating itfelf into the Points of the faid Chryftal, at 
its firft Coagulation, and when k was foft. 
Let us now fuppofe a Diamond lying in the Earth, and 
growing continually greater^ whofe Axis was the 4th part 
'of an Inch, or 150 Hairs breadth, and that fuch a Dia- 
mond in the.fpace of Ten Years was fo much encreasM, 
that its Axis or the Bignefs of its Body was augmented 
on every fide half a Hairs breadth, and fo proportionably 
^every Ten 5 by c onfeq ue itce Then itr of 
^000 Years its Axis wou’d be Three Hundred Hairs 
breadth greater, by which means the Diamond wou’d 
be Twenty Seven Times bigger than at firfV. 
Now if we fuppofe, that a Diamond in the fpace of 
Ten Years does incrcafe oh' all fides a Hairs breadth, its 
Axis wou’d be two Hairs breadth, which in 5000 Years 
wou’d be 750 Hairs breadth, and then the laft mention’d 
wou’d be 125 times bigger than the Diamond 
"whofe Axis was 150 Hairs breadth : Now fuppofing a 
Diamond whofe Axis was 150 Hairs breadth, and its 
C c c c 2 Weight 
