y2 ESSAYS 4np OBSERVATIONS’ 
Quer. VI.. May it not be inferred, 
that the component parts of opaque bo= 
dies are greater than thofe of tranfparent 
ones, as theory requires *, from this’ fim- 
ple obfervation, that the former, fuch as 
metals, ftones, woods, &c. when broken 
tranfverfely, fhew a vifible roughne(s and 
inequality at the’ fracture; whereas the 
latter, fuch as glafs, chryftal, gems, ice, 
&c. appear as fmooth, almoft, as. when 
they are polifhed ? 
Quer. VII. Do. not Newton’s experi- 
ments with the ifland and rock chryftal 
fufficiently prove, that the rays of liglit 
have different permanent properties in 
their different fides, relative to thefe two 
bodies ? Muft we not therefore conceive 
each particle of light to preferve its pofi- 
tion invariably while it moves forward, 
at leaft fo as not to revolve round its cen- 
ter perpendicularly to the direction of its 
motion ? Would it not be préper to try 
how light is inflected in pafling clofely 
by the feveral angles and fides of thefe fof 
fils ? 
* Newton’s opt. Book 2. part 3. prop. 4) 
| QUER.. 
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