PHYSICAL ann LITERARY. 95 
regular’ reflexion from the anterior fur- 
face of a denfer medium. But, will this 
fuppofition fuffice for explaining theregu- 
larity of refraction, and of reflexion, from 
the pofterior furface of a denfer medium: 
In both which cafes, the light muft actu- 
ally enter the pores of the attracting bo- 
.dy, and therefore approach much nearer 
to one inequality than another; fince the 
pores, by which it enters, are certainly 
much lefs than thofe inequalities! In wa- 
ter and other tran{parent liquors, this 
-muft certainly be the cafe, if their globu- 
lar particles touch one another, as is com- 
monly concluded from their incompreffi- 
os bility : For, as a number of {pheres laid 
together leave no rectilinear paflages be- 
tween them, the tranfmitted light muft 
pafs through the component particles ; 
and therefore the pores, by which it enters, 
muft be much lefs than the whole hemi- 
fpherical furfaces of the particles which 
evidently conftitute the inequalities of the 
_ general furface of the liquor*, 
Quer. 
* We are certain, that the inequalities of a craggy 
Fock or rough wall are much greater than the 
ed 
particles 
of 
