Quotation from: General Science

Written by: Bertha M. Clark


In the immediate neighborhood of three Philadelphia high schools,
having an approximate enrollment of over 8000 pupils, is a huge
manufacturing plant which day and night pours forth grimy smoke and
soot into the atmosphere which must supply oxygen to this vast group
of young lives. If the vital importance of nose breathing is impressed
upon these young people, the harmful effect of the foul air may be
greatly lessened, the smoke particles and germs being held back by the
nose filters and never reaching the lungs. If, however, this principle
of hygiene is not brought to their attention, the dangerous habit of
breathing through the open, or at least partially open, mouth will
continue, and objectionable matter will pass through the mouth and
find a lodging place in the lungs.

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