9 
when deprived of the Crystalline Lens. 
inch in diameter, with a dot in the centre, had been described 
near to its edge, was placed perpendicularly to the horizon, at 
5 inches distance from the eye ; another piece of pasteboard, 
with a circle and dot in it, was placed at the distance of 18 
inches ; the farthest circle was made a little larger than the 
other, that it might appear equally distinct at the greater dis- 
tance. When the eye was directed towards these two objects, 
they appeared upon the same level; and the circumference of 
the circles, had they been projected on the same perpendicular 
plane, would have been nearly in contact. 
Miles was placed opposite these objects, with his head made 
steady, and prevented from moving : he was then told to look 
at one, till it became very distinct ; and, when he had done so, 
this was removed, and he was directed to look at the other, 
which did not immediately appear to him with the same dis- 
tinctness. This was equally the case, whether he looked from 
the near one to the distant one, or the reverse : the eye did 
not see the object to which it was so suddenly directed, with 
the same defined outline as that from which it had been with- 
drawn. 
This man sees best in a strong light ; and it was in that light 
all the experiments were made : he can see very well in any 
degree of daylight; but his eyes are much fatigued by candle- 
light. Upon examining the eye attentively, the pupil was rather 
larger than in perfect eyes ; the iris was in a very perfect state ; 
and the cicatrix of the wound, in the inferior part of the cornea, 
was scarcely visible. 
The sight being so good, without the aid of glasses, is not 
common; and, had not the lenses been extracted in a public 
mdcccii. C 
