Show cold cok headed off chlorinated air has ahna been used very successfully ns as a preventive nilve of colds colda nai and lung troubles by the students of the chemistry division of the university sa s1 ty of missouri A small amount of chlorine ts is mixed with tho air and this Is sent into the he room through special ventilators rs bv this Ms means the air la Is pur purified idled ns as it enters the room and the use of air outlets maltes makes it possible for the air to be changed ns as often as it t to la thought necessary A decided improvement provement pro lias bas been noticed ho 60 for far as an the of colds Is concerned among the students |