100 Micr OGRAPHtAs 
which we think the moft folid ones, and appear fo to our fight, have nog. 
withftanding abundance of thofe grofier kind of pores, which will. ad- 
mit feveral kinds of liquors into them, why fhould we not believe that 
Glaf; and all other'tranfparent bodies abound with themfince we have 
many. other arguments, befides the. propagationof light, which feemto 
e for it? : : | reas 
And whereas it may be objected, that the propagation ‘of lightis no 
argument that there are thofe atomical pores in glafs, fitice, there are Hy- 
pothefes plaufigl@enough to folve thole Phenomena, by fuppofing the 
ae onely to'8e communicated through the tranfparent body. 
~ ‘Tothis I anfwer, that that Hypothefis which the induftrious\Agreanus 
has publifh’d about the flower motion of the end ofa Ray ina denfer | 
pany igargts ina more rare and thin, {cemis altogether unfufficient to folve 
abundance of Phenomena, of which this isnot the-leaft confiderable,that 
it\isim le from that fuppofition, that any colours fhould be gene- 
rated from the refraction of the Rays; for fince by that Pe paiboe tie 
undulating pulfe is always carried perpendicular, or at right angles with 
the Ray or Line of direction, it follows, that the ftroke of-the pulfe of 
light, after it has been once or twice refracted (through a Prifme.for ex- 
ample) muft affect the eye with the fame kind of ftroke as if it had not 
been refracted at all, Nor willit be enough for a Defendant of that Hy 
-pothefis, tofay, that perhaps it is becaufe. the refractions have made the 
Rays more weak, for if fo, then two refractions in the two parallel fides 
of a Quadrangular Prifme would produce colours, but we have no fuch 
Phenomena produc d. 
Thereiare feveral Arguments that I could bring to evince that there 
are in anfparent bodies fuch atomical pores. And that there is fuch 
a fluid bédy as I am arguing for, which is the #edinm, or Inftrument, by 
which the pulfe of Light is convey from the: /ucid body to the en- 
lightn'd. But that it being a digreffion from the Obfervations I was re- 
cording, about the Pores of Kettering Stone, it would be too much fuch, 
if I fhould protract it too long; and therefore I fhall proceed: to the 
next Objerwation. 
Obferv. XVI. Of Charcoal, or burnt Vegeta bie : 
Harcoal,or a Vegetable burnt black, affords an object ‘no le& pleafant 
4 than inftructive 5 for if youtake a {mall round Charcoal,and break 
it fhort with your fingers, you may perceive it to break withia very 
{mooth and {leek furface, almoft like the furface of black fealing Wax 
this furface, if it be look’d on with an ordinary Aficrofeope, does manifelt 
abundance of thofe pores which are alfo vifible to the eye in mainy kinds 
of Wood, rang’d round the pith, both a in kind of circular order, anda 
radiant one, Of thefe there are a multitude inthe fubftance of the Coal, 
every where almoft perforating and drilling it from end to ends by 
means 
