Everything that interferes with the clearing out from the body of all waste and dead material, by the excretions, tends to injure health. Breathing foul air, makes the blood impure, and promotes diseases of various kinds. Uncleanliness of the skin acts in the same way to a less certain and serious degree. Neglect of the bowels leads to costiveness, headache, and dyspepsia; now and then it brings on hernia (rupture) which may endanger life, or an obstruction of the bowels within the abdomen, from which not many who suffer it recover.