Gravel Top

Mr. Clemens Herschel, whose treatise on road tnaking is printed in the littla book on highway improvement issued by the League of American Wheelmen, writes as follows of the use of gravel as a substituto for broken stono on roadways: "Instead of tho macadam top, screened gravel may be used. The foundation for these gravel roads should be the same as the rough paving for the macadam road. The gravel to be used for the top most be selected with some care; it should be of a hard kind of stone, clean, that is, free f rm clay, of the right color, etc. It is put on in two layers, eacli rolled, and the top one mado compact and lirni, by spreading and mixing in some good binding material, sprinkliug and rolling. There need ba no fear of makiag a poor road by using the smootiiest, most water worn pebbles, free f rom all sand, etc, inmakinaroad top. The upper portions of the river Ithine are remarkablo for the clean, smooth pebbles tbat foriu its bed to a very great depth. These pebbles are dredged up and used in road building, makong' an excellent road covering at a email expense."