275 



the erect, attentive carriage of the ear, to compensate to some extent 

 for the w aning- \asion. 



The attacks vary greatly iu severity in different cases, ])nt the recur- 

 rence is characteristic, and all alike lead to cataract and intraocular 

 effusion, with pressure on the retina and abolition of sight. 



The preren/Zo/i of this disease is the great object tobe aimed at, and 

 this demands the. most careful breeding, feeding, housing, and general 

 management as indicated under causes. Much can also be done bj' 

 migration to a high, dry location, but for this and malarious affections 

 the improvement of the land by drainage and good cultivation should 

 be the final aim. 



Treatment is not satisfactory, but is largely the same as for common 

 internal ophthalmia. Some cases, like rheumatism, are benefited by 

 scruple doses of powdered colchicum and 2-dram doses of salicylate of 

 soda twice a day. In other cases with marked hardness of the globe 

 of the eye from intraocular effusion, puncture of the eye, or even the 

 excision of a portion of the iris, has helped. During recovery a course 

 of tonics (2 drams oxide of iron, 10 grains nux vomica, and 1 ounce 

 sulphate of soda dailj') is desirable to invigorate the system and help 

 to ward off another attack. The vulgar resort to knocking out the 

 wolf-teeth and cutting out the haw can onl^^ be condemned. The 

 temporary recovery would take place in one or two weeks though no 

 such thing had been done, and the breaking of a small tooth, leaving 

 its fang in the jaw, only increases the irritation. 



CATARACT. 



The common result of internal ophthalmia, as of the recurrent type, 

 may be recognized as described under the first of these diseases. Its 

 offensive appearance may be obviated by extraction or depression of 

 the lens, but as the rays of light would no longer be projierly refracted, 

 perfect vision would not be restored, and the animal would be liable 

 to prove an inveterate shyer. If perfect blindness continued by 

 reason of pressure on the nerve of sight, no shj'ing would result. 



PALSY OF THE NERVE OF SIGHT — AMAUROSIS. 



The causes of this affection are tumors or other disease of the 

 brain implicating the roots of the optic nerve; injury to the nerve 

 between the brain and eye; and inflammation of the optic nerve 

 within the eye (retina), or undue pressure on the same from dropsical 

 or inflammatory effusion. It may also occur from overloaded stom- 

 ach, from a i)rofuse bleeding, and even from the pressure of the 

 gravid womb in gestation. 



The symptoms are wide dilatation of the jiupils, so a.s to exi:)ose 

 fully the interior of the globe, the expansion remaining the same in 

 light and darkness. Ordinary eyes when brought to the light have 



