by manipulating the environment have
been apparent in Baltimore. In 1944,
there were about 400,000 rats, in 1947
about 165,000,1" and in 1949 about
65,000.12 This reduction has been accomplished
primarily by rehabilitation
of substandard dwellings (Figures 1 and
2), and spontaneous cleaning and repairing
of dwellings. The typical results are
shown in the history of 3 blocks (Figure
3). The "reference" block was not
treated in any way. The rat population
remained stationary for a while but has
decreased lately due to voluntary sanitation
and improvements. The " police "
block was rehabilitated by police sani,
by manipulating the environment havebeen apparent in Baltimore. In 1944,there were about 400,000 rats, in 1947about 165,000,1" and in 1949 about65,000.12 This reduction has been accomplishedprimarily by rehabilitationof substandard dwellings (Figures 1 and2), and spontaneous cleaning and repairingof dwellings. The typical results areshown in the history of 3 blocks (Figure3). The "reference" block was nottreated in any way. The rat populationremained stationary for a while but hasdecreased lately due to voluntary sanitationand improvements. The " police "block was rehabilitated by police sani,
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