Broken limbs, displaced joints, and wounds, are often causes of disease. Tight-lacing is also a mechanical cause of interruption to the right action of the lungs and heart, crowding these and other organs into too small a space. Position of the body acts mechanically, sometimes, in promoting certain maladies. Whoever is predisposed to apoplexy, is especially liable to have an attack while stooping, or lying with the head low.