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2488. Mouth Glue. The very useful preparation sold under this title is merely a thin cake of soluble glue, which, when moistened with the tongue, furnishes a ready means of uniting papers, &c. It is made by dissolving one pound of fine glue or gelatine in water, and adding half a pound of brown sugar, boiling the whole until it is sufficiently thick to become solid on cooling; it is then poured into moulds, or on a slab slightly greased, and cut into the required shape when cool. (See LIQUID GLUE, No. 2491.) [ECONOMY IS THE HOUSEHOLD MINT.] 2489. Paste. Paste is usually made by rubbing up flour with cold water, and boiling; if a little alum is mixed before boiling it is much improved, being less clammy, working more freely in the brush, and thinner, a less quantity is required, and it is therefore stronger. If required in large quantity, as for papering rooms, it may be made by mixing one quartern of flour, one quarter pound of alum, and a little warm water; when mixed, the requisite quantity of boiling water should be poured on whilst the mixture is being stirred. Paste is only adapted to cementing paper; when used it should spread on one side of the paper, which should then be folded with the pasted side inwards, and allowed to remain a few minutes before being opened and used; this swells the paper, and permits its being mere smoothly and securely attached. If kept for a few days, paste becomes mouldy, and after a short time putrid; this inconveince may be obviated by the use of: