The third wall contains the Southern Pacific Ocean, and the South Sea Islands.
The fourth wall has nearly the whole of South America.
Thus there are in the northern Room the whole Continent of Europe and Asia, the greater part of Africa, the whole of North, and part of South America; the lower, or Southern Room containing the remainder of Africa and South America, the Asiatic Islands, Polynesia and Australasia.
Supposing the windows of our room to be on one side, if we stand with our back to them, the first wall is on the left; this wall is divided into nine ladders, which show the longitude, and each ladder into nine steps, giving the latitude.
On the first ladder, first step, there is almost entirely sea, being a part of the Atlantic Ocean; a small portion of Africa, however, is discovered. On this part Sierra Leone is situated. The square on which this fails is known by the number 11, (1st. ladder, 1st. step,)—here the symbol for 11 is, the Pillars of Hercules. These pillars are placed in the square; one pillar is fixed in the sea, the other on land. Leone will recal to mind the name of a Lion; a lion must be placed between the pillars, and the situation of this place will then be fixed in the memory.
On the second step there is a part of the At-
