The jars, bottles, or boxes in which specimens are kept should be tight, to prevent evaporation, to keep out dust and mold, and to protect from insects. There are specially made museum jars of many attractive patterns. Four-sided fruit-jars with covers held by lever fastenings are also excellent. If one cannot secure such receptacles as these, he may prepare old bottles, and then fasten covers over them. Following are old methods of cutting bottles in two: —
1. Pass five or six strands of coarse packing-twine round the bottle on each side of the line where you want it divided, so as to form a groove 1/8 inch wide; in this groove pass one turn of a piece of hard-laid white cord, extend the two ends, and fasten to some support. Saw the bottle backwards and forwards for a short time; after a minute's friction, by a side motion of the bottle throw it out of the cord into a tub of water, and then tap on the side of the tub and the bottom will fall off.
2. Fill the bottle the exact height you wish it to be cut, with oil of any kind; dip, very gradually, a red-hot iron into the oil. The glass suddenly chips and cracks all round, then the upper surface may be lifted off at the surface of the oil.
3. For cutting off bottoms of bottles, make a slight nick with a file, and then mark round with a streak of ink where you want it to come off. Make an iron red-hot and lay it on the nick. This will cause it to expand and crack; then, by moving the rod round, the crack will follow.