the centre is every where. The whole circumference is equally distant from us wherever we may be. The four quarters of the northern hemisphere being arranged on the four walls, when we are in the room, we can, in an instant, see every part of the hemisphere. (See Plate IV.)
On the first wall will be a part of the Atlantic Ocean, the whole of Europe and a great part of Africa and Asia.
On the second wall will be found the remainder of Asia, and a large proportion of the North Pacific Ocean.
On the third wall there is a continuance of the Northern Pacific Ocean, and a part of North America.
On the fourth wall there is the remainder of North America, part of South America, the American Islands or West Indies, and a great part of the Atlantic or great Western Ocean. This completes the northern hemisphere, and occupies the first or upper room.
In the second or lower room, (see Plate V.) on the first wall, we have a part of the Southern Atlantic Ocean, part of Africa, and the Indian Ocean.
The second wall is occupied by the remainder of the Indian Ocean, the Indian Archipelago, and by New Holland.