Hessian
fly his crop is benefited, but if all in a community do so the
subsequent infection is greatly reduced with consequent advantage to
all. The chief obstacle preventing the successful combating of the
cotton boll weevil in the South has been the difficulty of securing
united action in the necessary cultural measures for its control. Most
striking results have been secured in the eradication of the Texas Fever
Tick from large areas of the South, although this has been carried on
using the county as a unit; for many purposes in the South the county is
practically a community. Some of the best community work in this field
has been in the West in poisoning ground squirrels and other injurious
rodents and in rabbit drives. Although the poisoning campaigns are
conducted over whole counties or several counties, they are organized by
communities and their success is possible only because every one in the
community does his part. Whenever the farmers of a community become
convinced that they are unable to fight a pest or disease individually,
but can do so if they act collectively so that a sufficiently large area
is treated as to prevent immediate re-infection, a new community bond
has been established. Whether these activities are carried on by
communities of the exact nature previously defined (page 10) is
immaterial. The significant fact is that their people are learning how
to act together in the common defense, for it was the common defense
which first compelled mankind to live in communities, and it is defense
for one purpose or another which is ever compelling the people of a
locality to act together.

Farm management experts point out the practical value to the farmer of
community experience with regard to methods of farm practice peculiarly
adapted to local climate, soils, and markets. If one is going into
dairying he can learn little from his neighbors if he locates in a fruit
section, but in a dairy section he may constantly learn from the common
experience. Dr. G. F. Warren says:

"There is so much to learn about farming in any community
that one man cannot hope to learn it alone. The experience
of the community is of the utmost value to every farmer.
Different men try out new varieties of crops, new machines,
different breeds of animals, different methods of raising
crops, different methods of building construction, different
ways of saving labor. Each man gets the