ECZEMA CHKONICUM, OK PSORIASIS. 135 



mals that are neglected, and from the accumulation of scabs 

 on the aspects of flexions of the knees and hocks, as well as 

 from the swelling around the eruption, the motion of the 

 joints is much impaired. This chronic eczema is frequently 

 seen on all four legs, and sometimes only on one or two. It 

 is very difficult to treat, and calls for great attention. 



The treatment of all the forms of eczema consists, firstly, 

 in giving a purgative, and then following this up by doses of 

 acetate of potash in water. A horse should have an ounce or 

 two of this salt daily, and a dog about half a drachm more 

 or less, according to the size of the animal. The diet should 

 be changed, and moderate, and the severe irritation of the 

 skin relieved by the application of an alkaline lotion, consist- 

 ing of liquor potassse in water, or a little carbonate of soda 

 in water. 



In all chronic forms of eczema, I find the internal admin- 

 istration of arsenic of the greatest benefit, and the skin 

 must be treated locally by means of frequent washing, oxide 

 of zinc or creasote ointment, glycerine lotion, and alkaline 

 preparations. 



IMPETIGINOUS OR PUSTULAR ERUPTIONS. 



It is not uncommon to observe in the lower animals 

 attacks of cutaneous inflammation of greater severity than 

 is necessary for the development of the diseases already de- 

 scribed. Suppuration occurs on the surface of the skin, and 

 beneath the epidermis. Pustules are therefore characteristic 

 of this class of inflammations, and the practitioner knows 

 that they characterise many diseases which he has to deal 

 with amongst horses and cattle. 



Two kinds of pustules have been described in impeti- 

 ginous affections in man, and they are both to be seen in the 



