DISEASES OF THE LIDS 39 



follicles are not involved, and the lashes grow again by 

 proper treatment. It often occurs in strumous sub- 

 jects, and accompanies catarrhal and other types of 

 conjunctivitis and the presence of pediculi. 



In the ulcerative type the above symptoms are 

 present, but more severe, together with ulceration, 

 which occurs beneath the crusts. This ulceration in- 

 -vades the hair-folKcles, and when the lashes are once 

 lost they fail to grow again. It is often due to infection. 

 Severe itching is often present, and rubbing the hds 

 tends to create a fresh focus for the growth of the 

 organisms. The lids are heavy and partly closed, and 

 the matting together of the lashes with crusts and 

 secretion makes the animal look as though it were suffer- 

 ing with some severe • constitutional disease. 



Treatment. — This should be directed to the cause. 

 If conjunctivitis or other diseases of adjacent struc- 

 tures exist, they should be met by appropriate thera- 

 peutic measures. 



In mild cases soften the crusts with vaselin, and, 

 after this has remained on for several hours, wash it off 

 with a mild alkaline solution, remove the crusts that 

 may remain, and apply an ointment composed of yellow 

 oxid of mercury 6 grains, and vaselin i ounce. 



In the ulcerative type the above treatment may be 

 employed, and when the lids are free from crusts the 

 ulcers may be touched with a 2 to 10 per cent, silver 

 nitrate solution, the tincture of iodin, or a 25 per cent. 



