The Esquimaux and the inhabitants of the extreme north at times endure a temperature of--60 degrees F., while some of the people living in equatorial regions are apparently healthy at a temperature as high as 130 degrees F., and work in the sun, where the temperature is far higher.

In the engine-rooms of some steamers plying in tropical waters temperatures as high as 150 degrees F.have been registered, yet the engineers and the stokers become habituated to this heat and labor in it without apparent suffering.

In Turkish baths, by progressively exposing themselves to graduated temperatures, persons have been able to endure a heat considerably above the boiling point, though having to protect their persons from the furniture and floors and walls of the rooms.

The hot air in these rooms is intensely dry, provoking profuse perspiration.

Sir Joseph Banks remained some time in a room the temperature of which was 211 degrees F., and his own temperature never mounted above normal.
There have been exhibitionists who claimed particular ability to endure intense heats without any visible disadvantage.