Of course, the jars must be perfectly clean, the covers ditto, and fit exactly, and the rubbers new and of good quality. Sometimes, though very seldom, two old rubbers that seem good can be used in place of one new one, but it is always more or less of a risk to try this. Jars, covers and rubbers about which there is the least bit of doubt had better be kept for very sweet or spiced preserves, catsups or hot relishes, that do not spoil easily. The wise housekeeper, as soon as she empties a glass jar of its contents, immediately washes and dries the jar, cover and rubber band, and puts the jar away in a dust-proof place with the rubber band and a small lump of charcoal inside and the cover screwed on loosely. This saves time and trouble for the next canning season, when the task of fitting cans and covers is especially wearysome. However, if this was not done, it will be necessary to try all the cans and covers. This is best done the evening before they are wanted. Wash and rinse the jars and covers thoroughly, using some baking soda with hot water, until you are sure each jar is sweet and clean. Then put some clean water in each jar, put on the rubbers and the covers that seem to fit best, screw tight, and let the jars stand on their heads all night. The leaky ones can then be easily taken out the next morning, and perhaps tried with other covers, or set aside for other use. The foregoing directions apply chiefly to the old-fashioned glass cans with zinc porcelain-lined covers-when the new glass covered snap or lightning jars are used, there need be no matching of covers and jars.