The perfection of dress, for day or night, where warmth is the purpose, is that which confines around the body sufficient of its own warmth, while it allows escape to the exhalations of the skin. Where the body is allowed to bathe protractedly in its own vapours we must expect an unhealthy effect upon the skin. Where there is too little ventilating escape, insensible perspiration is check ed, and something analogous to fever supervenes; foul tongue, ill taste, and lack of morning appetite betray the evil.