' 42 ESSAYS anp OBSERVATIONS 
fcheme, more properly incident light re- 
flected. 
35. THE chief or only fact which feems 
to have led him into that opinion, is, that 
there are many coloured bodies, fuch as 
metals, which are capable of receiving a 
fine polifh; and therefore of reflecting 
regularly the images of other objects, and 
at the fame time retain their proper co- 
lour by which they are feen in all pofiti- 
ons. That light by which we fee in them 
the images of other objects, he acknowled- 
ges to be incident light properly reflected 5 
but the other, he fuppofes, is properly e- 
mitted from the colorific parts of the bo- 
dy. But what neceflity is there of recur~: 
ring to this fuppofition, when we know, 
previoufly, that the component parts * of 
all opaque bodies are tranfparent; that, 
from every tranfparent body, there is a 
double reflection; part of the incident 
light being reflected at the firft furface, 
and a part of what pafles thro’ the firft, 
reflected at the fecond? And when we 
know, 
* Newt, Opt. book 2. part 2. prop: 2. 
