C 532 ] 
often baffled the fuccefs of the bed: operations ; Inch 
as the riling again of the cataradt, violent defluxions 
and inflammations, which often deftroyed the eye, 
the hurting of the vitreous humour, which feldom 
failed in couching, &c. 
In both the operations, which I faw, the patient, 
immediately after, could diftinguilh all large objects 
in the room. 
Paris, Sept. 25, 1752. 
Read Dec. n/y'N regard to the remarks made by the 
,/52 ‘ Ikilful in your letter, he (M. Daviel) 
fays, that he has found, by experience, that all thofe 
inftruments are neceflary : and as to the extent of 
the incifion, he fays, that he leldom makes it above 
one half of the circumference of the cornea tranjpa- 
rens ; and that a fmaller opening would not fuffice to 
let the crystalline flip out eafily; the diameter of 
which, in general, not being above a line lefs than 
that of the cornea , and, in fome cafes, within half a 
line, infomuch that, in order to make it pafs thro’ 
the pupilla , he has been obliged to give a fnip of 
the feiflars to the iris, which, he allures me, is at- 
tended with no bad confequences. 
In anfwer to w T hat is faid, that it has been pradtifed 
before, and that Taylor formerly performed it, he 
endeavours to prove, that it never was, excepting in 
cafes where the cryflalline had, by fome accident, 
llipt thro’ the pupilla into the anterior chamber. 
In regard to the operation, there is fome mention 
made of it among the Arabians, as what they 
had heard of; but the operation is not deferibed 
particularly any- where. One convincing reafon, that 
it 
