H

SEWER GASES.

THEIR NATURE & ORIGIN,

AND

HOW TO PROTECT OUR Dwellings.

BY

ADOLFO DE VARONA, A.M., M.D.

=

Not until the properties of air and water and food are
taught in schools in preference to the abstract rules of
grammar, and the distorted facts of history, will men
come to understand the magnitude of the crime that is
committed by those who poison the air of their cities, the
water of their rivers, the supplies of their market places.

D. VAN NOSTRAND, PUBLISHER,
23 MURRAY AND 27 WARREN STREET.

188,2.