The tin molds are best for this purpose, either melon, round, or brick. If the mold is buttered first, then sprinkled with granulated sugar, a nice crust will form. Have a large, deep pan filled with boiling water. Place mold in, let water come up to rim, put a heavy weight on top of mold to keep down, and boil steadily. The pan must be constantly replenished with boiling water, if the pudding is to be done in time. Always place paper in top of mold to prevent water from penetrating. When puddings are boiled in bags, a plate must be placed in bottom of pan to prevent burning. Only certain puddings can be boiled in bags. Always grease inside of bag, so puddings will slip out easily. A bag made of two thicknesses of cheese-cloth, stitched together, will do. Always leave room in mold or bag for pudding to rise, using a smaller or larger mold according to quantity of pudding. If not boiled steadily, and emptied as soon as done, puddings will fall and stick.