23G THE NATURE AND TREATMENT OF 



tumefaction of (he lids of one eye, and a little pus, or matter, 

 can be detected, the probability is that some foreign body, such 

 as a piece of hay, straw, or dirt, has insinuated itself between 

 the ball and eyelid, and has become lodged there ; in a case 

 of this character, the lids must be carefully inverted, one after 

 the other, and examined. 



The removal of the foreign body is equivalent to a cure, for 

 very little, if any, after treatment is needed, with the excep- 

 tion of cleansing the eye with cold water. 



SPECIFIC OR PERIODICAL OPHTHALMIA. 



This dangerous form of disease is termed periodical, because 

 having once made its appearance, there is a liability of a re- 

 currence ; it is not, however, so prevalent among cattle as 

 among horses. It is a disease which, finally, is sure and cer- 

 tain to end in cataract, or disorganization of the eye ; in this 

 stage, perhaps the butcher would be the best doctor. 



It may be proper, however, to give the reader some idea of 

 the nature and symptoms of this malady, so that common oph- 

 thalmia may not be confounded with nor mistaken for it. It 

 has been observed, in the preceding article, that common 

 ophthalmia was confined to the membranes of the eye ; the 

 disease now under consideration, makes its ravages on the inner 

 structures of the eye, the external covering being only sympa- 

 thetically involved. On parting the swollen lids, and if the 

 cornea be not too opaque, we shall find that the aqueous humor 

 is thick and muddy, the iris, lens, and other internal parts are 

 altered in texture and structure, in fact, the eye has all the ap- 

 pearance of being ruined, which is probably the case. 



The remote causes of this disease are constitutional pre- 

 disposition. 



There are several other affections of the eyes of oxen and 

 cows, but as they are incurable, the subjects must be referred 

 to the butcher. 



CANCER IN CATTLE. 



Cancer is a peculiar malignant growth, affecting one or more 



