py 
PHYSICAL ann LITERARY. rs 
the femi-diameters of two of the neareft 
particles in the fame or in different rays, 
foon after their emiflion, are incompara- 
bly lefs than their diftance. | 
4. Let us confider a little the courfe obs 
particleof light from any of the remoter fix- 
ed ftars to the human eye; for inftance, 
from the {mall one called the Rider in the 
tail of the Great Bear: The particles by 
which we fee that ftar, have, in the firft 
place, paffed thro’ the fpace furrounding it, 
in which there are probably feveral planets 
revolving, and which mutt be therefore fo 
filled with a {phere of rays from each of 
them that they may be vifible to aneye any 
where fituated in thofe {paces ; after that, 
they have paffed laterally thro’ the:whole 
torrent of light flowing from the ftar of 
the fecond magnitude which we fee befide 
it; and laftly, they have pafled likeways 
acro{s the whole ocean of the folar light, 
and all that light with which the {pace fur- 
rounding the fun is filled from all the co- 
mets, planets, and fatellites; and befides, 
_in every phyfical point of their numerous 
journey from the Ader to our eye, they 
have | 
