The sight of blood is at all times disquieting to the layman, and is particularly alarming in the case of pulmonary hemorrhage. Even the attending physician shares in the perturbation produced by a copious hemorrhage, knowing his comparative impotence in coping with the condition. It is generally conceded that there is no direct hemostatic for blood coming from the lungs because of the inaccessibility of the bleeding point. The medicinal agencies usually resorted to are such, as is believed, bring about a formation of blood-clot in a more or less indirect way. Some of these agents are directed to the heart, reducing its force, as aconite; some to the arteries, diminishing their pressure, as the nitrites; others, again, to the lungs, limiting their activity, as opium. Some are assumed to act on the blood itself, increasing its coagulability, as the calcium salts; others by reducing its bulk, as saline cathartics.