PHYSICAL anv LITERARY. 357 
a crefcent as poffible, this makes the in- 
cifion larger, and keepé the cicatrice more 
off the fight; lift up the flap of the cut 
cornea with the {coop B (Fig. 4.) or any 
other ‘convenient inftrument ; introduce 
at the fame time a common couching’ 
needle C, (Fig. 5.) thro’ the pupil, to 
open. the cap/ula of the cryftalline Jens, that 
the latter may come the more eafily out. 
A fmall aperture generally ferves this 
purpofe ; if the Jens is of a firm contift- 
ence, it often fticks to the point of the 
needle, fo that when the inftrument is 
withdrawn the cryftalline comes along 
with it; if it does not, a very gentle pref: 
fure upon the eye forces it out. The ope- 
ration may be frequently performed with 
the knife alone, the cap/ula of the cryftal- 
une being fometimes fo thin, that, after 
the cornea is cut, a fmall preffure on the. 
eye makes the /ens come away. 
Tus method of operating is much the 
fame with that pradctifed by M. Daviel, 
which you'll find at large in the Memoirs 
of the Academy of Surgery, vol. ii. p. 337. 
Ihave followed the example of the fa- 
aR | ous 
4 
