442 Mr. andre’s Microjcopic Defer ip t ion cf the Eyes 
muft be removed from the Ihell, and applied to a fingle mi- 
crofcope with a very ftrong light. 
The internal furface of the large eyes, examined with the 
microfcope, is found to be thick fet witn a great number of 
fmall, tranfparent cones, of an amber colour*, the bafes of 
which hand downward, and their points upwards next the eye 
of the obferver +. 'T 'he cones in general have an oblique direc- 
tion, except fome in the middle of the cornea . », about thirty in 
number, the direction of which is perpendicular. The center 
of every cone being the moft tranfparent part, and that through 
which the light pahes ; on tiiat account the perpendicular or 
central cones always appear beautifully illuminated at their 
points. In a word, they are all fo diipofed as that a certain 
number of them receive the light from whatever point it may 
hiue, and tranfmit it to the immediate organ of light, which 
we may reafonably fuppofe is placed underneath them ; but 
this laid circumftance can only be determined in a recent fub- 
je&, which 1 have never been fo lucky as to fee. The cones 
are not all of the fame length ; thofeon the edges of the cornea 
are the longeft, from whence they gradually diminilh as they 
approach the center, where they are not above half the length 
of thofe on the edges, fee rig. 2. 
As thele cones 10 eafly tranfmit the light through their 
Jubilance, when I firft examined them I thought they were 
tubes ; but I have fmee viewed them broken in different direc- 
tions, and am convinced they are folid tranfparent bodies. If 
they be viewed with a deep magnifier, every cone appears di- 
vided tranfverfely by two or three internal fepta or partitions. 
1 have made fome attempts to afeertain their number, and think they amount 
k> about 1000. 
t This m,lft be rcvcrfctl if <>>« eye be coniidered in its natural pofition. 
4 % 
This 
