[ S 2o ] 
that the incurability proceeded from the nature of 
fome other diftemper complicated with the cataract:. 
'Twas hard to tell why, the cataradt once couched, 
the patient ffiould remain blind, or why it ffiould rife 
again into its place. 
This new operation ffiews us, that not only the 
cryftalline, but even fometimes its capfula, and Some- 
times only the anterior membrane of this bag, are 
opaque, fometimes adherent to, fometimes feparated 
irom, the body of the cryftalline. 
Sometimes the anterior membrane of this bag has 
been found opaque, and the cryftalline tranlparent, 
and, in all thefe cafes, the patients have recovered 
their fight. 
Dr. Fallon, bearer of this letter, has afiifted with 
me at a very difficult oporation of the cataradt, and 
is to prefent you a fmali box, in which are three 
packets. 
N° i . Contains a portion of the anterior membrane 
of the Capfula cryflallim. This humour, being ftill 
tranfparent, was left untouched. The patidnt faw 
perfedtly well after the operation. 
N° 2. Contains an opaque cryftalline, and a portion 
of the anterior fide of its bag, quite opaque. The pa- 
tient recovered his fight. 
N° 3. Contains the whole bag and cryftallini, ex- 
tradted the 14th of this month. ’Twas adherent to 
the pofterior, and fuperior, fide of the iris j and was 
quite whole and plump, when drawn out. 
It this laft.cafe, it commonly happens, that fome 
portion of the vitreous humour follows 5 fometimes it 
mixes with the aqueous, and comes off with it ; fome- 
times the eye appears quite funk ; and fometimes the 
vitreous 
