The following cement, which does not require to be kiln-dried, may be used with pedestals, etc., out of doors. The materials required are silicate of soda, or water-glass: carbonate of lime; chloride of calcium; and quartz, or pure flint sand: this, if from the sea shore, should be well washed and sifted; if Bedfordshire sand, sift it to .get uniformity, and wash it once. Take 1 gal. of silicate of soda and 1 bushel of mixture of flint sand and a small quantity of carbonate of lime; mix mechanically, and pour into the mould and then pour over the mixture the chloride of calcium. Another cement is washed silicious sand 3 parts, shellac 1 part. Melt the shellac, and moidd into the sand while warm.