166 DISEASES OF THE HORSE. 
and secure it by pressing a little raw cotton down upon 
it in such a manner as to keep out the dirt. In two or 
three days repeat, if necessary. It rarely requires a 
second dressing. - 
CANEER. 
This is a more aggravated form of thrush, often prov- 
ing very troublesome to manage. It is a continuation 
of the thrush between the horny frog and. the internal 
structures of the foot, causing. separation between them. 
Treatment: Cut away all the horn which has been sepa- 
rated from the soft structures of the foot, and apply the fol- 
lowing aintment: Take equal parts of pine tar and lard, 
melt over a slow fire, and add sulphuric acid very slowly 
until ebullition ceases ; or use collodion, $ 0z., castor oil, 1 
oz.; mix and apply to the parts. The foot must be pro- 
tected from dirt by a bandage or a leathern boot. 
SCRATCHES. 
This disease is well known to all horsemen. Treat- 
ment: Wash the parts well with castile soap and water, 
and when dry apply once a day the collodion and castor 
oil recommended in canker; or use a saturated solution © 
of the bichloride of mercury once a week, but not oftener, 
or mischief may arise in consequence of a too free use. 
GREASE HEELS. 
This is a white, offensive, greasy discharge from the 
heels of the horse; the skin becomes hot, tender, and 
swollen; the acrid character of the discharge often 
causes large portions of the skin to slough away, leaving 
an ugly sore behind. Treatment: Open the bowels with 
the following ball: Barbadoes aloes, 1‘ 0z., pulverized 
gontian root, 2 dr., pulv. ginger, 1 dr., water sufficient 
