...ferent kinds, and as the bricks are always laid so as lends strength and a not unattractive appearance to both sides of such walls.In the states of Maxilua and Callet, in Further Spain, as well as in Pitane in Asia Minor, there are bricks which, when finished and dried, will float on being thrown into water. The reason why they can float seems to be that the clay of which they are made is like pumice-st...