ABSCESS OF THE CORNEA. 183 
such as a blow, a scratch from thorns, or from the presence of a foreign body 
which has lodged in the eye. 
In mild cases the cornea loses its transparency and becomes cloudy and 
opaque; while with some types of the affection ulcers are often present. 
In the first instance the eyes are very watery and thejaffected cornea has a 
diffuse grayish-blue or grayish-white coloration. Its surface also appears 
slightly irregular and uneven. 
Where ulceration occurs in the cornea there is the same cloudiness and opa- 
city, and similar coloration; the eyes are also watery; they are very sensitive to 
the light, and the discomfort is greater. 
In occasional cases the ulceration becomes so deep that the eye seems to 
burst, perforation of the sclerotic membrane occurring, and allowing the contents 
of the anterior chamber of the eye to escape through the opening. 
The resulting opacities may become entirely absorbed in the course of time, 
though this is contrary to the general rule; which is, that while they may lessen 
considerably in extent, they yet persist as dense white spots. Opacities which 
form in severe attacks of distemper, and occasionally in other constitutional dis- 
eases, are, however, notable exceptions, because in such cases, being quite super- 
ficial, the cloudiness usually clears up quickly and without medical interference. 
Where corneal opacities threaten to be permanent it will be well to use eye- 
drops composed of the oil of turpentine, one part, and oil of almonds, two parts. 
The lids being separated, one drop should be allowed to fall on the eyeball; 
and one application be made daily. It may prove too stimulating in an occa- 
sional case, and excite considerable inflammation ; in which event the proportion 
of the oil of almonds should be increased. 
Superficial ulcers may heal and leave no trace; but generally they also 
produce permanent opaque spots. 
Where perforation has occurred there is adhesion of the iris and lens to 
the posterior wall of the sclerotic membrane, or other marked change from the 
normal, which it is not possible to entirely overcome. 
The corrosive sublimate ointment advised in Chronic Conjunctivitis, and 
applied in the same way, should be tried in corneal inflammation. That failing 
to have good effect, unless further medical treatment can be applied or directed 
by a professional, dogs with uncomplicated corneal inflammation or ulcers should 
be left to nature to effect a cure, being in the meantime kept in good healthy 
quarters, well fed, confined during the day, and exercised at night. 
‘ABSCESS OF THE CORNEA. 
The outermost tunic or covering of the eye is called the sclerotic membrane. 
This is really composed of two different membranes; one of which forms the 
