will be intelligible on all maps, and to all persons.
The best mode of learning the geography is to take a chart of Mercator's projection of the earth, in which the degrees of latitude and longitude are marked by tens, that it may coincide with the divisions on the walls, each of the squares there containing 100°; 10° both ways. All the squares in the map must be covered with a sheet of paper, except one, that is the first step on the first ladder; the space taken up by the land in this square should be noticed, and the outline of the land described in the map, and traced upon a drawing, or diagram, of the first wall, divided into ladders, and ladder-steps, as seen before. These squares should be sufficiently large to show some of the principal projections of the land, that the most remarkable places may be inserted; thus constructing a small chart.
In the lower room, which contains the southern hemisphere, we must count downward, 1, 2, 3, 4, 5, 6, 7, etc. still beginning with the equator.
Every one of the small squares may be divided into degrees.
