[ 5 21 1 
vitreous humour filling, as it were, the pofterior 
chamber, makes the iris bulge forwards, and appear 
prominent upon it, the whole togetheL refembles a 
kind of hernia. Thefe two laid cafes require a nice 
and prudent hand : the prominent vitreous humour is 
to be cut off, in two or three days aiter the operation, 
the eye then banded, but not comprelfed, and the 
patient laid in his bed, the head lower than, ufual, 
till the reft of the vitreous humour gets back into its 
cells, and remains there. This we have feen examples 
of; the vitreous humour regenerates, and,, though a 
great portion of it be loft, ’tis iupplied again, fooner 
or later, and the patient recovers his fight. 
I faw Daviel extrad the cryftalline quite opaque, 
with its whole bag adherent to it; and this bag I dif- 
fered from it, after the operation was over. 
In the operation of the 14th inftant, the cryftal- 
line, and its whole bag, made one entire fphasroid, 
foft and plump ; but ’tis already broke, and dry. 
Blue eyes are the moft fubjeft to the cataraft, and 
black ones to the amaurofis. In thefe, the ciliary 
nerves and fibres are always weak ; in thole, ftiong 
and elaftic. 
1 . A cryftalline couched, if the capfula be opaque, 
leaves the patient blind. . 
2. A cryftalline couched in appearance, ft it ad- 
heres, in any point, to its capfula, muft rile again. 
-1. If the pofterior fide of the bag be opaque, an 
remains, the patient muft remain blind, whether the 
cryftalline be couched or extrafted. . 
4 If the pofterior fide of the bag is adnerent to 
the cryftalline, it muft be extracted ; and then, there 
is great danger of the vitreous humour coming oft. 
° X x x 2 5- The 
