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[FATHER AND MOTHER ARE KIND, BUT GOD IS KINDER.] 2541. Casting Second Half of Mould. Into the small pudding basin from which the sand has been emptied, place with the egg upper-most the half mould, which, if the operation has been managed properly, should fit close at the edges to the side of the vessel; then prepare some more liquid plaster as before, and pour it upon the egg and mould, and while it is hardening, round it with the spoon as with the first half. 2542. Completion of Mould. In due time remove the whole from the basin; the halves will be found readily separable, and the egg being removed, the mould is ready to cast in, after it has been set aside for an hour or two, so as to completely harden. This is the simplest form of mould, and all are made upon the same principle. 2543. Casting Egg in Wax. The casting of an egg is not merely interesting as the first step in a series of lessons, but as supplying a means of imitating peculiarly charming objects, which the student of natural history tries almost in vain to preserve. We shall proceed, then, with the directions for the casting of an egg in the mould. 2544. Materials required. For the first experiments, common yellow wax may be used as the material, or the ends of half-burnt wax candles. The materials of the hard (not tallow) composition mould candles will also answer. 2545. Large Castings made Hollow.