This is one of the terminations of inflammation of the eye. It is opacity sometimes of the membrane covering the crystalline lens, but much oftener of the lens itself. The dog is peculiarly subject to cataract. The majority of old dogs become blind from this cause. Nothing can be done, even from the commencement of the obscurity of the lens, for the part is too deeply seated for our applications to reach it.

This is another (somewhat unfrequent) cause of blindness in the dog. The eye itself is perfectly clear, but the retina - the expansion of the optic nerve within the eye - is paralysed, and consequently insensible to the impression of light. There are a few instances of the successful treatment of this species of blindness.

Much depends on the cause of it. If it is the consequence of violence, it never can be cured. If it has come on very slowly, little good can be expected; but when it appears unaccompanied by other disease, there may be some slight hope. A strong emetic may be given, followed by an active purge. The emetic should be repeated on the third day, and the bowels kept in a state of purgation. A seton should be inserted in the poll, and, if the dog is fat, a moderate quantity of blood should be taken away.

The purgatives should be continued, united with tonics, and the best tonic in this case is the chamomile.

Recipe (No. 13). Tonic Ball For Gutta Serena

Take - Powdered Chamomile-flowers, one ounce: Powdered rue, half an ounce; Ginger, two drachms; Palm-oil, seven drachms: Beat them well together; divide them into twelve, sixteen, or twenty balls, according to the size of the dog, and give one morning and night