two together extend six inches and three quarters, and leave a lap of two inches and a half for the next header, which being laid, lies with its middle upon the middle of the header below, and in this manner the bond is continued. The brick-bat thus introduced next to the corner header is called a closer. The same effect might be obtained by introducing a three-quarter bat at the corner in the stretching course, for then when the corner header cores to be laid over it, a lap of two inches and a quarter will be left at the end of the stretchers below for the next header, which being laid, the joint below the stretchers will coincide with its middle, and in this manner the bond may be continued as before.

Fig. 2 a fourteen inch, or brick and half wall. In this the stretching course upon the one side is so laid, that the middle of the breadth of the bricks in the heading course upon the opposite side falls alternately upon the middle of the stretchers, and upon the joints between the stretchers.

Fig. 3 a two brick wall. In the heading course, every alternate header is only half a brick thick on both sides in order to break the joints in the core of the wall.

Fig. 4 a two brick and a half wall, bricks laid as in Fig. 3.

PLATE XXV.

Contains various specimens of Flemish bond according to the different thicknesses of walls. The dotted lines show the disposition of the bricks in the courses above.

Fig. 1 a nine inch wall where two stretchers lic between two headers, the length of the headers and the breadth of the stretchers extending the whole thickness of the wall.

Fig. 2 a brick and a half wall, one side being laid as in Fig. 1, and the opposite side, with a half header opposite to the middle of the stretcher, and the middle of the stretcher opposite the middle of the end of the header.

Fig. 3 another disposition of Flemish bond where the bricks