THE HORSE, SKIN DISEASES, ETC. 285 



with a solution of one grain of chloride of zinc to one gill of water ; and 

 the trouble will soon be over. 



XV. Tetter. 



Causes. — This seems to arise from some constitutional cause, which it 

 is difficult to point out. It appears on horses of different conditions or 

 habit of body. On some it breaks out periodically, Summer after 

 Summer. 



It is not contagious, unless neglected until it assumes the epizootic foiTxi, 

 which it sometimes does, after which it is communicable te both man 

 and horse. 



There are said by some to be two or three forms of tetter, but in 

 reality whatever different forms it may assume, when not complicated 

 with other affections, they are indications of (different degrees of severity. 



How to know it — The attack is usuaHj^ sudden, and the animal is 

 observed to rub himself severely, as suffering from intense itchiness. 

 The neck, shoulders, back, and thighs are the points ordinarily affected. 

 Upon examination, the skin will be found red with inflammation, some- 

 times torn or scratched by rubbing ; and the blisters or pimples will 

 be seen on those parts of the inflamed spot not so torn or scratched. 

 These blisters break, and a watery fluid is discharged, which keeps the 

 surface moist. 



In its more advanced stage it may be taken for mange ; but it may be 

 distinguished from mange by its manifesting less tendency to spread and 

 invade all parts of the skin ; and by the absence of parasites under the 

 scabby portions. 



What to do, — First, see that the horse's bowels are put in good condi" 

 tion. If there is any tendency to plethora, (too great fulness), to 

 constipation, or general feverishness, give him a purgative dose ; and in 

 any event let his food be of such character a? to prevent costiveness. 



Give, once a day, an ounce of Fowler's solution of arsenic. Eub the 

 affected parts well with sweet oil, and let it ^remain thereon for a few 

 hours ; then wash with warm soapsuds so as to remove the scabs or 

 scales. Then cover the diseased surface and some portion Tjf the healthy 

 •kin all round with the following ointment : 



Ko. 22. % Lb. flour of sulphur, 



yi. Lb. carbonate of potash* 



1 Oz. carbolic acid, 



2 Lbs. lard, 



2 Lbs. olive oiL 



