When made into stucco for covering a wall, the following table will show the ex tent of surface that a bushel of cement may be made to cover when used pure or with various proportions of sand, and at certain thicknesses :

1 bushel of cement will cover 1and 1/8 yards 1 inch thick, 1½ yards ¾ inch thick, 2¼ yards ½ inch thick; 1 bushel of cement and 1 of sand, 2¼ yards 1 inch thick, 3 yards ¾ inch thick, 4½ yards ½ inch thick; 1 bushel of cement and 3 of sand, 3½ yards 1 inch thick, 4½ yards ¾ inch thick, 6¾ yards ½ inch thick.

As cement will not keep, especially in a moist atmosphere, the amateur, when he requires a small quantity for repairs, is recommended to buy just so much as he wants and no more.

In making concrete, it is important, in the first place, that the aggregate, be it what it may, should be deposited on a clean place if on old boards, as scaffold boards, so much the better—so that no dirt may get mixed up with it. The concrete itself should be made on boards, nailed together on ledges or on three putlogs placed on the ground parallel to one another, forming a rough platform. The aggregate and the cement or lime used as the matrix must then be placed on the boards, the aggregate being measured out first, and the proper proportion of concrete to the aggregate being also measured out and thrown upon it. The heap is then wetted with water poured over it from a large water-pot fitted with a fine rose, and the whole is then mixed until the materials are thoroughly amalgamated.