When the discharge is excessive we are aware of moisture upon the skin; but, aware of it or not, the discharge is always going on; and, what is more, if it be checked, or if a considerable portion of the skin be glazed, so that it becomes impervious, death will result. This is why people die in consequence of scalds or burns which injure a large surface of the skin, although they do not touch any vital organ; multitudes of minute tubes which should carry off injurious matters from the blood are closed, and, though the remaining surface of the skin and the other excretory organs take extra work upon them, it is impossible to make good the loss of what may be called efficient drainage over a considerable area. Therefore, if the brain is to be duly nourished, it is important to keep the whole surface of the skin in a condition to throw off freely the excretions of the blood.