1 volume of cement powder to 2 volumes of dry sand.

In India, to the water for mixing the plaster is added 1 lb. of sugar. or molasses, to 8 Imperial gallons of water, for the first coat; and for the second or finishing, 1 lb. sugar to 2 gallons water.

Powdered slaked lime and Smith's forge scales, mixed with blood in suitable proportions, make a moderate hydraulic mortar, which adheres well to masonry previously coated with boiled oil.

The plaster should be applied in two coats laid on in one operation, the first coat being thinner than the second. The second coat is applied upon the first while the latter is yet soft.

The two coats should form one of about 1½ inches in thickness, and when finished it should be kept moist for several days.

This process may be modified l>y substituting for the first coat a wash of thick cream of pure cement, applied with a stiff brush just before the plaster is laid on.

When the cement is of too dark a color for the desired shade, it may be mixed with white sand in whole or in part, or lime paste may be added until its volume equals that of the cement paste.

Khorassar.or Turkish Mortar, used for the construction of buildings requiring great solidity, 1/3| powdered brick and tiles, 2/3 fine sifted lime. Mix with water to the required consistency, and lay on layers of 5 and 0 inches in thickness between the courses of brick or stones.