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October 11, 1930


JAMA. 1930;95(15):1100-1101. doi:10.1001/jama.1930.02720150040012

The adaptability of the human organism to marked variations in its external environment—changes in temperature, humidity, movements of the air and isolation—is so well perfected under the usual conditions of living that one rarely stops to consider the limitations that are sometimes imposed on such adjustments. The adult supplements his innate capacity to survive in unfavorable surroundings by means of suitable clothing, together with artificial heat or cooling devices, as the circumstances may demand for his physiologic welfare or personal comfort. Furthermore, he has learned in recent years from hygienic studies that some of the once feared and supposedly noxious factors that may insidiously threaten him are after all of negligible significance. This observation refers particularly to the product of his own respiratory functions—carbon dioxide—to variations in the oxygen content of the inspired air, and to the vague toxic components supposed to vitiate the air that has been breathed by

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