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To Render Walls Water-tight

It is proposed by Mr. F. Ransome, of London, to render stone and brick walls watercure a piece of thin platinum wire, and twino it once or twice round a pin's point, so as to form a minute ring with a handle to it. Break up a piece of flint glass into fragments a little larger than mustard seed; place one of these pieces on the ring of wire, and hold it in the proof by coating them to saturation with a point of the flame of a candle or gas-light. solution of silicate of soda, which is superfi- The glass will melt and assume a complete cially decomposed by the further application lens-like or globular form. Let it cool grad- ( of chloride of calcium. The surface thus obtained consists of silicate of lime, which is perfectly insoluble, and therefore water-tight, while it does not alter the appearance of the wall. (See No. 2171.)