Show I SNOW CL CLEANSES AIR Chicago Experiments Show Its Effect Upon Street G Germs The cleansing effect upon the atmosphere atmosphere atmosphere atmos atmos- phere of ot snowfall Js s Illustrated by a report report report re re- port of the Chicago BOard Board of Health Op January shallow shall w glass dishes containing the usual l preparation favorable favorable favorable favor favor- able to the growth of atmospheric germs were exposed to the air for for three minutes min min- utes in ten different localities within the half mile bounded bounded by by South Water State and Adams str streets ets and Fifth avenue After two seventy-two hours' hours In Incubation these showed an aVera average e of colonies of growing germs the the- greatest number number number num num- ber 1050 being f found und at the northeast corner of Dearborn and Washington streets a few feet feet- the street level the h least ast south court between the city hall hall and and the county building and the next fewest on the the roof of or the city hall hail about feet above the s street level On the snow srn h I fell to the equivalent 1 of of an inch of rain and the experiment was re repeated re rd- I on the The average colonies colonies colo cole nies from these latter exposures numbered numbered numbered num num- sixty-six sixty ranging from nineteen at t the southeast corner of La Salle and at the southeast southeast southeast south south- South Water streets to east corner of Washington and Fifth avenue The atmosphere was nearly 90 per pes per cent ent purer on the after the snowfall than it was before American American Medicine ne |