Fire-Proof, a term which expresses the effect of certain applications to combustible substances, especially in buildings, with a view to prevent them from being reduced to ashes. This important object may also be attained by means of erecting whole houses with a mixture or earth and clay, well beaten together, as devised by M. CointereaU, in his "School of Architecture" (8vo. Hildburg-hausen, 1703, in German); an ingenious work that, we believe, was originally published in the French language. Although we are persuaded that such a method of raising edifices is not only durable and economical, but.-the buildings also are thus effetiually seemed from fire, yet it will be of great impor-ance to afford security to combust tible dwellings already erected. For this useful purpose, M. Bou-lard, architect, at Lyons, has lately discovered a very simple remedy, attended with little ex-pence or trouble, and admirably calculated to defend wooden materials from being consumed by flames, though exposed to their influence for two hours. After many tedious experiments, he found that a solution of pot-ash is the most efficacious liquid for resisting the action of fire, longer than any other fluid. This observation induced him to apply that substance in a kind of paint or coating on wood, which was completely rendered fire-proof, in the following easy manner: Dissolve such a quantity of pot-ash in cold water as that fluid is capable of holding in solution, wash or daub with it all the boards, wainscoting, shingles, etc. which are intended to be prepared. Then dilute the same liquor with a little water 5 add to it such a portion of fine yellow clay as will make the mixture of the consistence of the common paint employed on wood : and lastly, stir into it a small quantity of flour-paste, in order to combine both, substances intimately. With this mixture all wooden materials ought to be coated three or four times, similar to painted work. Thus, wood will be secured from the action of fire, though exposed to it for a time exceeding two hours ; but the greatest advantage of this excellent preparation consist a In the circumstance, that it prevents the wood from ever bursting into flames. - M. Boulabd remark's, that 20lbs. of sifted yellow clay, l1/2|lb. of Hour for making the paste; and .1lb: of pot-ash, are sufficient to prepare a square rood (French measure and weight) of deal boards; so that the expences, when com-pared with the importance of the object, are indeed trifling. It is farther deserving of notice, that even furniture made of wood, such as chairs, tables, etc. and particu-larly the stair-cases and flooring of dweliing-houses, may be so far enabled to resist the ravages of the fire, that they are only reduced to Coals, or embers, without spreading the conflagration by additional flames : meanwhile, there are gain-ed, at least, two hours, during which all valuable effects may be removed to a place of safety, and the lives of the family at the same time rescued from all danger.