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Show ix-:-x-i-: x-:-s-:-z-:-x-:-x-m-xox-:-x-m-m:-:-z-:-x-x-m-z-m-i-m-:.i-:.z-:-2:- , Many "Colds" Caused by Poor Ventilation j ' I To find better preventive methods, doctors In recent years have been studying the common cold more carefully care-fully than ever, and two authorities have summarized the supposed causes of this affliction under live headings: chills and drafts, comliiions of the weather, Irritation of the membrane on' the breathing apparatus, infection and bad ventilation. The last Is regarded re-garded as t he commonest of all the causes, as warm stagnant air produces congestion and swelling in the mucous membrane which becomes covered with a thick secretion and affords a weak spot for germs to attack. In cool air, this membrane remains tan' and well moistened. Then, in a poor ly ventilated room, cold currents of air are likely to strike the feet while the head is exposed lo the warm, polluted upp.'-- atmosphere. This Is Just the reversr of what is considered the ideal condition for hf tilth, "cool j breezes blowing around the head, the radiant heat of the sun. aud a warm ground to stand on." Exposure alone will not cause colds In healthy Indl- ! viduals, the doctors declare. Arctic explorers, fishermen, and others who remain out of doors for long hours In stormy, cold weather, often seem Im- j mune from these disorder. Irrltntlob of the mucous membrane of the re piratory possages by dusU and chemicals chem-icals is ulso a common cause of colds. 1 Popular Mechnr.ics Magazine. j |