It is now definitely known that
on this knowledge depends the success of the various canning methods.
4. Since commercial canning provides nearly every kind of foodstuff, and
since cold storage and rapid transportation make it possible to supply
almost every locality with foods that are out of season, it has not been
deemed so necessary to preserve foods in the home. Nevertheless, the
present day brings forth a new problem and a new attitude toward the
home preservation of foods. There are three distinct reasons why foods
should be preserved in the home. The first is to bring about _economy_.
If fruits, vegetables, and other foods can be procured at a price that
will make it possible to preserve them in the home at a lower cost than
that of the same foods prepared commercially, it will pay from an
economical standpoint. The second is to promote _conservation_; that is,
to prevent the wasting of food. When fruits and vegetables are
plentiful, the supply is often greater than the demand for immediate
consumption. Then, unless the surplus food is preserved in some way for
later use, there will be a serious loss of food material.
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