The Chicago public laboratories recently made tests to determine
the amount of soot and dust deposited from the air in that
city. The acreage deposit, as estimated from samples collected
at eight different heights during a period of four weeks, was,
approximately, at the rate of 8.5 tons per acre per year. On
the Board of Trade Building, 110 feet above the street level,
the estimated annual deposit was 10.5 tons. On the county
building, 160 feet above street level, the amount was 7.8 tons,
and on the Reaper Block, 120 feet above street level, 12.6 tons.
The situation in Chicago is different only in degree from that
prevailing in every large city. It would be interesting (and no
doubt appalling) to know how many tons of soot enter the lungs
of the inhabitants of our large cities.--_Good Health._
(3010)
=Sorrow=--See SUFFERING TRANSFORMED.