Insensible perspiration is that transmission of watery particles through the skin which is constantly going on, but which takes place so gently that it cannot be perceived. It is, however, very important in its results, as no less than from twenty to thirty-three ounces of water may pass imperceptibly through the skin in twenty-four hours.
1012. What is sensible perspiration?
Sensible perspiration is that moisture which exudes upon the skin in drops large enough to be perceptible, when the body is heated by exercise or other means.
"And Elisha sent a message unto him, saying, Go and wash in Jordan seven times, and thy flesh shall come again to thee, and thou shalt be clean."—II kings v.
1013. Why does a sudden change from heat to cold bring on illness?
Because the effect of cold arrests the action of the vessels of the skin, and suddenly throws upon the internal organs the excretory labour which the skin should have sustained.
1014. Why does a chill upon the skin frequently produce inflammation of the lungs?