Note 6 — Chapter II
Reading edition
"Bodily functions are facilitated by atmospheric conditions which make evaporation from the skin and lungs rapid. That weak persons whose variations of health furnish good tests, are worse when the air is surcharged with water, and better when the weather is fine; and that commonly such persons are enervated by residence in moist localities but invigorated by residence in dry ones, are facts generally recognized. And this relation of cause and effect, manifest in individuals, doubtless holds in races."—Herbert Spencer, Principles of Sociology, Vol. I, p. 21.