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Show Uncle Sam, RL D. 1 EY U 3. PUBLIC HEALTH SERVICE. iThii Is the third of four articles en "Bad Air." One of our greatest errors in ventilation Is In maintaining our homes at too high a temperature. Slxty-flvc to r.s degrees Fahrenheit Is about right, instead of 70 to 75 degrees, which Is not ' uncommon Wilh n proper humidity, a temperature of 05 degrees Is Just ns comfortable to git in as 'i temperature of 70 degrees with the humidity low. Whan people get a proper appreciation of this fact, they finrj that it is probably easier to supply the humidity than to tup. pl lii" extra coal necessary to raise the temperature 5 degrees throughout the house In the mailer of humidity, tho great majority of houses disregard this entire ly. Most indoor air is far too dry. The humidity hu-midity should be from 50 to 65 per cent, l'sually It is from L'.r to 35 per cent, or V) pet cent at the most, "in hot air furnaces ihe wa)ar pan is provided, but it Is more frequently empty i ban full, and Is In itself inadequate In anv case. Hot water and steam systems are still worse. They have no provision whatever for adding moisture lo the air. Thin dryness to the indoor air Is responsible re-sponsible for much of the dry, hacking laryngeal coughs so common in winler, and which have been designated us lh-winter lh-winter cough. The dry air craves mois ture and extracts it from every sourt s available. Including our skin and mucous membrane. The correction of low humidity Is not an easy problem. The water pan of a hot air furnace should be kept filled constantly. Plants scattered about the house and kept well watered dallv I,. Ip io , -. lent. Shallow pans filled vvnh vvatei and placed on the radiators and registers will evaporate considerable quantities of w atcr |