Lay whatever fancy pieces are used for the decoration carefully in place on the bottom of the mold. With a spoon add only enough jelly to moisten them; if too much is used, the pieces will float out of place. Let the jelly harden and fix the decoration; then add as much as will make a layer one half inch thick; let that set; then place the material which is to fill the center. If it is a bird, or anything in one piece, add a little jelly to fix it in place; then fill up the mold. If the material is a soft substance, set in the double mold (see below); or, if one is not at hand, add a few spoonfuls at a time of the filling, leaving a space of one half an inch around the sides, and fill this with jelly. Proceed in this way until the mold is full, having the top covered with jelly, so that when unmolded it will form a complete case. If ornament is used on the sides of the mold, arrange the decoration when the mold is filled to the right height, dip the pieces in jelly to make them adhere, and cover them very slowly at first, so they will not float off. When the filling is to be in alternate layers with jelly, proceed in the same way, adding one layer at a time, and letting each one harden before the next is placed. The mold should not be moved while being filled; one layer should not become too hard before the next one is added, and no dampness must settle on them. Any of these causes will make the jelly liable to separate when unmolded. If the mold is placed on ice, as directed, the jelly hardens quickly, and the filling is soon accomplished.