Circulation of the Blood.--Nothing is more important for the health or healing of any organ or part of the body than a good supply of arterial blood. Venous blood, collected by the veins after it has done its work all over the body, or blood stagnating in congested organs, is useless for growth and healing. To promote a vigorous circulation of blood in any part we wish to cure is, then, of great importance; this may be done by helping the heart in various ways, especially if that be weak. Lying down, and lying comfortably on the face, greatly assists circulation. Placing a fainting person in this position will often suffice to restore him. In congestion of any part, if possible keep that part,--head, hand, or foot, as the case may be--above the level, so that the escape of blood from it may be easy. _Raising_ an inflamed finger or toe thus, and keeping it up, will often relieve severe pain. In inflamed kidneys, make the sufferer lie on his face as much as possible. Other positions in other cases will be suggested by common sense. Again, heat expands the vessels of the body, and cold contracts them. Cooling a congested part assists to drive excess of blood out of it, and heating some other part opens accommodation for the blood so expelled. This explains our hot poultice and fomentation as used with cold cloths. Common sense will show us how to apply it as a principle of treatment in many cases. Again, a congested limb may often be very greatly relieved by proper rubbing along the soft parts, the strokes being firm and steady, and directed from the extremity of the limb towards the body. This rubbing along the thigh relieves very much all swellings in the foot, ankle, leg and knee. This principle may be widely applied by a little common-sense thought.