140 The Diseases of Animals 
é 
eurely tied in a knot. Otherwise, the horse, getting the 
blister on the tail and then switching other parts, may 
cause a blister wherever the skin is thin. The: horse’s 
head should also be tied so that he is unable to reach 
the blistered part with his nose, or there will be a 
larger blister on his nose than on the original part. It 
is a good plan to tie a horse so short that he cannot le 
down while the blister is retained. In the course of three 
or four weeks the part. may be treated again, if necessary, 
but the second blister should be very light, as the part 
is tender and the drug acts quickly. When a part is 
blistered too severely the tissues may be destroyed and 
slough out, leaving a bad sore and finally a scar; or 
the roots of the hair may be destroyed, or the hair in- 
jured so as to cause it to turn white. The two front 
or the two hind legs should not be blistered at the 
same time. In rare cases a blister irritates a horse and 
causes intense suffering soon after it is put on. It 
should be washed off at once, the part greased and, if. 
necessary, laudanum given internally. To an adult 
horse, ounce doses of laudanum can be given every 
three hours nntil he is quiet. 
Fly - blister applied over a large area sometimes 
causes severe irritation of the kidneys, with painful 
passage of the urine. Should such symptons appear, 
the blister must be washed off at once, the part greased, 
and the horse given gruels and other mucilaginous 
drinks, combined with landanum in half-ounce doses to 
soothe the irritated parts. When it is necessary to 
apply an irritant over a large surface,—as in inflamma- 
tion of the lungs, pleurisy, and some bowel troubles,— 
