C 906 ^ 
to Lc in a continual Motion, whereby thofe Particles 
that are in the Tumca Corneci^ be their Motion never fo 
fmall, fe^m to us, as if they were moling in the air,but by 
ftrid examination we (hall find, that they are one and 
the fame Particles, which fometime appear Afcending, and 
at other time« Defcending. 
Befides the aforementioned Blood Veffels, we find in the 
Tunica Cornea round Particles that lye fcatter'd about, 
which Particles I judge to be Globules of Blood 5 an 
ignorant perfon feeing thefe Particles in continual Motion, 
for as I faid before, fometimes they appear Afcending, and 
fometimes Defending, would be apt to fay, that thefe 
Particles were nqf in his Eye, but in the air before the 
Glafs 5 and perhaps too, that the d?"fcending particles 
were the Influxes ot the Star, and thb(e^tiT^^em d Af- 
cendingthe exhalations of the Earth, dr"^ other BS3?&i&'' 
It has often befallen too, when I lookt S^ainft a flrohg^ 
light, thro my Microfcopes, that Haw an infinite number* 
ot exceeding fmall Particles, that had all aglitteriqg 
Motion. 
I never imagined that thefe Particles were in the 
Air, as others would, but rather that they were in 
the Chriftiahne humor of the Eye between the Tunka 
Cornea and the Crlftalma , the motion of which 
fmall Particles is cccafioned by preffing the Tunica Cornea^ 
when we (hut our Eyeclofe together. 
But how is it poffible to conceive, that the Influences of 
Stars can arrive to our fight, by the means of magnifying 
Glaffes, efpecially if we believe, with that great Aftrono- 
mer, Chrijiian Huygen^^i Lord of Zuylichem ("while he lived 
my great f riend) that the dilbnce of the neareft fixt Star 
from the Sun is fo very great, that if a Cannon Bullet were 
(hot from the Sun to the fixt Star, it would be feven hun- 
dred thoufand years in motion before it arrived. 
In 
