Show cou colds headed off chlorinated air has been used very successfully as a preventive of colds it and lung troubles by the students of 0 the chemistry division of the university of missouri A small amount of chlorine Is mixed with the air and this Is sent into the room through special 1 ventilators entila tors rs dy this means the air Is pu purified ifield as it enters the room and the use of air outlets makes it possible for the air to be changed as often as it Is thought necessary A decided im pr ement has been noticed so far nip aa the prevalence of colds Is concerned among the students |