The necessity of cooperation and organization in the work of rat
destruction is of the utmost importance. To destroy all the animals on
the premises of a single farmer in a community has little permanent
value, since they are soon replaced from near-by farms. If, however, the
farmers of an entire township or county unite in efforts to get rid of
rats, much more lasting results may be attained. If continued from year
to year, such organized efforts are very effective.