"Though I walk in the valley of the shadow of death I will fear no evil, for thou art with me."—Psalm xxiii.
176. Is the atmosphere ever as hot as the human body?
Not in this country. On the hottest day it is 10 or 12 deg. cooler than the temperature of our bodies.
177. What is the highest degree of artificial heat which man has been known to bear?
A man may be surrounded with air raised to the temperature of 300 deg. (the boiling point being 212), and yet not have the heat of his body raised more than two or three degrees above its natural temperature of from 97 deg. to 100 deg.
178. Why may man endure this degree of heat for a short time without injury?
Because the skin, and the vessels of fat that lie underneath it, are bad conductors of heat.
And because perspiration passing from the skin and evaporating, would bear the heat away as fast as it was received.