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16 and he is also attended by satellites, two having been already discovered, and more not improbably existing. An idea of the relative diameters of the Sun and Planets may be formed from DIAGRAM X, in which the whole coloured circle represents the Sun, the Planets being arranged on it in their proper order, and of their proportionate sizes. A more exact idea of their relative distances from the Sun, than could be conveyed in Diagram 2, is afforded by DIAGRAM XL If the distance of the Earth from the Sun be taken as 10, then that of Mercury will be 4, Venus 7, Mars 16, Jupiter 52, Saturn 100, Uranus 196, and Neptune 300.* A good idea may be formed of the relative magnitudes and distances of the parts of our system, by the follow- ing illustration :—Choose a level field, and on it place a globe two feet in diameter ; this will represent the Sun. Mercury will be represented by a grain of mus- tard seed, on the circumference of a circle 164 feet in diameter, for its orbit. Venus by a pea, on a circle 284 feet in diameter. The Earth also by a pea, on a circle of 430 feet. Mars by a rather large pin’s head, on a circle of 654 feet. The nine Asteriods, by grains of sand, in orbits of from 1000 to 1200 feet. Jupiter , by a moderate sized orange, in a circle nearly half a mile across. Saturn by a small orange, on a circle 4-5 ths: of a mile. Uranus by a full-sized cherry, upon the circumference of a circle more than a mile and a halt in diameter. And Neptune by a large plum, on a circle * It has not been thought desirable to introduce the orbit of Neptune into the diagram, in its proper proportion; as all the other orbits must have been reduced to little more than half their present size, which would have rendered some of them undistinguishable.