210 
MANUAL OP MODERN FARRIERY. 
gelatinous fluid, resembling the white of at egg. It fills 
about three-fourths of the globe of the eye, and extends 
from the posterior part as far forward as the ciliary liga 
ment. 
q. The aqueous, or water-like humour which fills the space 
between the cornea and the crystalline lens. 
It is by means of this humour that the cornea is preserved 
in its rounded form. A small portion of it is behind 
the iris. 
r. The retina, or fine net-like expansion of the optic-nerve, 
which is spread over the whole of the choroides, as far as 
the lens. 
i. The optic-nerve, or nerve of sight. 
t. The conjunctiva, or that membrane which covers the fore 
part of the eye, and which lines the lids, and even extends to 
the transparent portion of it. It is transparent, and transmits 
colour to the parts beneath. It is very liable to inflamma¬ 
tion, during which the vessels of the lining of the lids will 
become gorged with blood, and present an mtensely red 
appearance, which extends itself to those vessels in the 
white of the eye, which will also become completely covered 
with blood, and will ultimately render the cornea clouded 
and opaque. This membrane is the seat of almost all the 
diseases of the eye; many of which too frequently terminate 
in total blindness. 
A defect of sight in the horse is more dangerous than 
total blindness, for this reason, that one with a defect of 
sight will start and shy at every object which he meets with 
upon a road, and the rider may be thrown off when he least 
expects it; while a horse that is quite blind will generally 
resign himself to the guidance of his rider or driver. 
THE TEETH AND THEIR DEVELOPMENT. 
Mastication in the horse is performed in two ways, namely, 
by a champing motion, and also a grinding motion. 
At o, plate iii. fig. 1, is the masseter-muscle, which is of 
