Make a bag of thick flannel, somewhat larger than the part to be covered. Half fill it with hot bran, hops, chamomile flowers, or whatever is to be used. Apply to the part on which it is intended to act. Retain it there by a bandage. When the bag and contents become cooled, quickly remove, substituting a few thicknesses of hot flannel until the bag can again be heated by placing it on a tin plate in the oven, or by holding it over burning coals, being careful, of course, not to scorch it.