CANNING
As canning is the method of preservation most commonly used, practice should be given in this method. In rural schools with a limited equipment, it may be that only one jar can be prepared. In other schools, it may be impossible to provide each pupil with material for work, on account of the expense. In the latter case, the materials may all be brought from home, or each pupil may bring her own jar and fruit, and the school supply the sugar.
Instruction on the care of jars and the preparation of fruit and syrup must precede the practical work.
CARE OF JARS
1. See that the jars are air-tight; partly fill the jar with water; place rubbers, covers, and rims; screw tightly, and invert. If any water oozes out, the jar is not air-tight. Often an extra rubber will correct the trouble.
2. Wash the jars thoroughly with the aid of a small brush.
3. Sterilize the jars in every part; dip them in boiling water, or place them on a rest (folded paper or wooden slats) in a kettle, to prevent the jars from touching the bottom. Fill and surround them with tepid water, then place them over heat until the water boils. Keep them in the boiling water until ready to fill with fruit. Dip the rubber bands in boiling water, but do not allow them to remain in it. Use new rubbers each season.
4. When filling the jars, place them on a folded cloth wrung out of warm water, then seal, and invert until cool.
PREPARATION OF FRUIT
Use fresh, sound fruit, not too ripe.