TRANSLATIONS FROM CONTINENTAL JOURNALS. 24 7 
it from the sclerotica without tearing its fibres, so closely are 
they united, more particularly at the point corresponding to 
the ta'petum . The sclerotica presents at its convex surface 
a coat of pigment, which is, so to say, almost organized and 
transformed into a distinct, downy, villous, velvety, brownish 
tissue, which seems to be composed of a mass of fibres 
closely intermixed with one another. When the eye of the 
horse is put in alcohol a second leaf or layer is perceived, 
belonging to the choroid, and covering the anterior surface 
of this membrane. This leaf is more apparent on the surface 
of the tapetum. It is of a brownish colour, very thin, semi- 
diaphanous, and easily torn. In the eye of the horse I have 
distinctly seen the membrane of Jacob, which is extremely 
delicate, thin, and diaphanous, and is situated between the 
retina and the choroid. When the eye is much shaken in 
water this thin membrane detaches itself in the shape of 
small, triangular fragments, which float in the water. 
Qncl 06s. —Capsulo-lenticular cataract, anterior crystalloid 
double sub-retinal effusion, atronhy of the eveball (No. 
169). ^ 
It is the eye of a horse slightly atrophied, but not much 
diminished in size. This eye presents alterations which 
have often been found in eyes atrophied consequent on 
specific ophthalmia, viz., accumulation of a yellow-reddish 
fluid in the cavity, formed behind by the choroid, and ante¬ 
riorly by a membrane formed by the remains of the retina, 
the hyaloid, and the posterior crystalloid. This membrane 
constitutes a pseudo-membranous tissue, extending behind 
the lens, which, however, it leaves free. It is thin, but firm, 
unequal in thickness, varying from half a millimetre to a 
millimetre, but terminating by a triangular thickening, the 
base of which measured at different points from four to eight 
millimetres, and it pushes against the corpus ciliari in every 
part. In this manner the false membrane forms a partition 
which divides the ocular cavity into two compartments, one 
anterior, and the other posterior; the former filling the space 
occupied in the normal state by the anterior and posterior 
chambers and by the crystalline apparatus. The posterior 
compartment occupies the space of the vitreous humour and 
the retina. The posterior wall of this compartment is formed 
by the doubled sclerotica and the choroid, both of them normal, 
except their having receded ; and their unevenness is sympto¬ 
matic of the slight atrophy of the globe of the eye. The 
sub-choroidean cavity is thus somewhat smaller than in the 
healthy eye, occupied by the retina and the vitreous humour, 
but larger than the same cavity in most of the sub-choroidean 
