xvi 
or other of their eyes direfted towards objefts on 
whatever fidothey prefent themfelves : allthefe littlfe 
hemifpheres are real eyes ; having in the middle of 
each a minute tranfparent lens and pupil ; through 
which, objefts appear topfy turvey, as through a con¬ 
vex glafs ; this becomes alfo a fmalr telefcope when 
properly placed. 
Mr. Leeuwenhoek looked through the eye of an 
infeft (with the help of a microfcope) as a telefcope; 
and viewed the fteeple of a church which was 299 
feet high, and 750 feet from the place ; he could 
plainly fee the fleeple, though not apparently larger 
than the point of a fine needle : he like wife viewed a 
houfe, and could difcern the front ; diftinguifh the 
doors and windows ; and perceive whether the win¬ 
dows were open or {hut. 
Mr. Hook computed 14000 hemifpheres in the two 
eyes of a drone. 
Mr. Leeuwenhoek reckons in each eye of the 
dragon fly, 12544 lenfes; or in both 25088: the 
oiftures of objefts painted thereon muff be millions 
of times lefs than the images of them piftured on 
the human eye. There is no doubt that in lefts {fill 
fmaller, have eyes contrived to difcern objefts fome 
thoufands of times lefs than themfelves ; for fo the 
1 
minute particles they feed on muff certainly be,* 
What a power then of magnifying are fuch eyes en¬ 
dued with! And what extraordinary difeoveries 
might 
