This is the residue left after the evaporation of the volatile oil from common white turpentine. When resin is burned, it emits copious visible fumes, which may be breathed with impunity, and sometimes exercise a happy influence in cases of bronchial disease, and suppurating non-tuberculous cavities in the lungs. They are more excitant than the vapours of tar, and adapted only to cases in which the parts affected are in a state of very decided relaxation and debility, without the least suspicion of acuteness in the accompanying inflammation. The resin is employed by being thrown upon red-hot coals (not anthracite) in a shovel, or on the shovel itself heated to redness or nearly so; and the patient is to be in such contiguity as may enable him to inhale the fumes, without being oppressed, or suffering material irritation from them. He should be cautious at first, and gradually increase his exposure, as he finds he can tolerate the remedy without inconvenience.