57. GENERAL DIRECTIONS.--The canning of vegetables may be most
successfully done by the one-period cold-pack method. Tomatoes,
however, because of the large quantity of acid they contain, may be
canned and kept with little difficulty by the open-kettle method, but
they will be found to keep their shape better if the cold-pack method
is employed.
The time required for cooking any vegetable after it is packed in jars
depends on the kind and the age. Therefore, if a vegetable is hard or
likely to be tough, it may be necessary to increase the time given in
the directions; whereas, if it is young and tender or very ripe, as in
the case of tomatoes, the time for cooking may perhaps have to be
decreased. Because, in altitudes higher than sea level, the boiling
point of water is lower than 212 degrees Fahrenheit, the length of time
for boiling foods in the water bath must be increased after an altitude
of 500 feet is reached. Therefore, for every additional 500 feet over
the first 500 feet, 10 per cent. should be added to the time given for
the boiling in water. In case a pressure cooker is used, however, this
is not necessary.
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