In purchasing glass jars, only what are known as _first quality_ should
be selected. Cheap jars are likely to be seconds and will not prove so
satisfactory. Glass jars may be purchased in sizes that hold from 1/2
pint to 2 quarts. If possible, food should be canned in the size of jar
that best suits the number of persons to be served.
If the family consists of two, pint jars will hold even more than may be
used at one time, while if the family is large the contents of a quart
jar may not be sufficient.
[Illustration: FIG. 3]
22. Numerous types of glass jars are to be had. Some of them are more
convenient than others and may be made air-tight more easily. These two
features are the most important to consider in making a selection. Jars
that close with difficulty, especially if the tops screw on, are not
likely to keep food successfully because the bacteria in the air will
have a chance to enter and thus cause the food to spoil.
Glass jars used for canning foods have improved with canning methods.
The old-style jars had a groove into which the cover fit, and melted
sealing wax or rosin was poured into the space surrounding the cover.
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