IN passing round the curve leading into the interior of the earth, it seems difficult for some people to understand how water can be made to stay on the edge of the earth. A question of that nature seems absurd to many; but it is not. While water is a liquid and seeks its level, yet the centre of gravity is all there is to "up" or "down," and affects everything in accordance with its weight. As water is heavy, gravity forces it to the earth. Whether gravity is something in the earth that draws, or something in the air or ether that repels, I do not know, nor do I know anyone that does. Whatever it be, it draws the water to the earth with such force that there is no danger of its being spilt. Gravity at the curve, or at the turning into the interior of the earth, acts like a large magnet. Take a magnet, bent in a circular form, and see if there be any difference "A secret doubt lurked behind all the reasoning. It seemed as though the longer I defended my theory, the nearer I came to doubting it. But no; there is no getting over the evidence of that Siberian driftwood." (Page 303.) Whenever the explorers pass into the interior of the earth, as they have beenAROUND THE CURVE.