In almost all diseases, the function of the skin is, more or less, disordered; and in many most important diseases nature relieves herself almost entirely by the skin. This is particularly the case with children. But the excretion, which comes from the skin, is left there, unless removed by washing or by the clothes. Every nurse should keep this fact constantly in mind,—for, if she allow her sick to remain unwashed, or their clothing to remain on them after being saturated with perspiration or other excretion, she is interfering injuriously with the natural processes of health just as effectually as if she were to give the patient a dose of slow poison by the mouth. Poisoning by the skin is no less certain than poisoning by the mouth—only it is slower in its operation.