Charges are plasters which act chiefly by mechanical pressure, being spread on while hot, and then covered with tow. They are not much used among dogs, but in strains they are sometimes beneficial, as they allow the limb to be exercised without injury. The best for the dog is composed as follows:

87. - Canada balsam, 2 ounces.

Powdered arnica leaves, 1/2 ounce.

Melt the balsam, and mix up with the powder, with the addition of a little turpentine, if necessary. Then smear over the part, and cover with tow, which is to be well matted in with the hand; or use thin leather.