( •5?8. ) 
f^articles, of which there may be a thouftnd in one fmall 
grain, there fliould be an exact Hmilitude. 
For !ct U!> conclude fas I have oltcn fuppos'd^ that cur 
common Sand, of which one grain differs from anutl.er 
in pcllucidity, wag found at firft \^ 'nh Imooth fiJcb and 
iharp points, the faid points and fides are fo rubb 1 one 
againft't other, that (everal fmall pits or holes may be per- 
ceived in chem, whereby they lofe their InrW fieure vd 
wIk) can conceive what changes thofe Particles o\ >and 
undergo, that lye next the 1 iperfaiies of the Terrtftial 
Globe^ and efpecially fuch asly^- fome depth under a 
ftony ground where laden W.iggon^ paftorten, for ih^c 
Particles of Sand,by frequent conipreilions and colliHons, 
wonnd each other, indenting holes in their fidti>, and 
breaking off the (harp Points or Angles h not to mention 
what alterations are made in theleimall bodies by Storms, 
Thunder, Earthquakes, &c. 
After having exerted my poor Obfervations on theft 
matters, I got fome (liining Sand from . n uld Ceniltman, 
a Kinfman of mine, who was Pref< nted with me fame by 
a Book keeper belonging to the Eajt huu Con p;in\,' in 
the year 1648. and to the beft of my ren. mbrijvce ( Iks 
us'd toflrow their Letters with fuch a kinJ.ot :^and about 
that time. 
This Sand^ tho very thin, was not tranfparenf, the 
fhiningnefs being wholl/ occafioned by the reflexion 
of the Light from the polifht lides , fever?! Panicles of 
thefiid Sand, which were much bigger than t!.e reft, did 
not refleft any Light, tho to the naked Eye they feen.'d 
imooth 5 from whence I concluded, that they had loft 
their glance by a frequent rubbing their fides againft o- 
thers. 
When I viewed feveraj grains of the above^aid 
Sand with my Microfcope, I was furpriz d to fee that 
many of them were hexangularr a^id the more, when 
I had fifred the an eft fro ai the eourleft 5 neither could 
I 
