Logs of wood floating in a pond approach each other, and afterwards remain in contact. The wreck of a ship, in a smooth sea after a storm, is often seen gathered into heaps. Two bullets or plummets, suspended by strings near to each other, are found by the delicate test of the torison balance to attract each other, and therefore not to hang quite perpendicularly. A plummet suspended near the side of a mountain, inclines towards it in a degree proportioned to its magnitude; as was ascertained by the wellknown trials of Dr. Maskeleyne near the mountain Skehalion, in Scotland. And the reason why the plummet tends much more strongly towards the earth than towards the hill, is only that the earth is larger than the hill. And at New South Wales, which is a point on our globe nearly opposite to England, plummets hang and fall towards the centre of the globe, exactly as they do here, so that they are hanging up and falling towards England, and the people there are standing with their feet towards us. Weight, therefore, is merely general attraction acting every where. It is owing to this general attraction that our earth is a globe. All its parts being drawn towards each other, that is, towards the common centre, the mass assumes the spherical or rounded form. And the moon also is round, and all the planets are round; the glorious sun, so much larger than all these, is round; proving, that all must at one time have been fluid, and that they are all subject to the same law. Other instances of roundness from this cause are—the particles of a mist or fog floating in air; these mutually attracting and coalescing into larger drops, and forming rain; dew drops; water trickling on a duck's wing; the tear-dropping from the cheek; drops of laudanum; globules of mercury, like pure silver beads, coalescing when near, and forming larger ones; melted lead allowed to rain down from an elevated sieve, which cools as it descends, so as to retain the form of its liquid drops, and become the spherical shot lead of the sportsman. The cause of the extraordinary phenomenon, which we call attraction, acts at all distances. The moon, though 240,000 miles from the earth, by her attraction raises the water of the ocean under her, and forms what we call the tide. The sun, still farther off, has a similar influence; and when the sun and moon act in the same direction, we have the spring tides. The planets, those apparently little wandering points in the heaven, yet affect, by their attraction, the motion of our earth in her orbit, quickening it when she is approaching them, retarding it when she is receding.—Arnott's Natural Philosophy.