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25 side of the Earth, or at the opposition, it is plain that the whole of her enlightened side is seen; she is then said to be full. She then again begins to diminish Until she arrives at the conjunction, when she is totally obscured. The Moon always keeps the same side turned towards the Earth ; and in consequence, all parts of her globe are successively opposite the Sun, during one revolution round the Earth. DIAGRAM XXL is an imaginary view of the Earth as' seen from the surface of the Moon. It is nearly certain from obser- vations upon the Moon’s disk, that she has neither atmosphere nor water on her surface; but that it has been broken up by violent volcanic action. An attempt here made to represent the probable character of that surface, as seen by an observer situated upoii it. The Moon not only receives direct light from the Sun, but reflected light from the Earth, which will serve as a Magnificent moon to the Moon; its apparent size to an observer on the Moon being thirteen times as great as Mat of the Moon is to us. It will present the same succession of phases as the Moon does to us ; but will full at our new Moon, and vice versa. As the planets and their moons derive their light entirely from the Sun, they throw a dark shadow behind them, where they intercept the Sun’s light, vrom the immense proportional magnitude of the Sun owever, this shadow is of a conical form, and converges o soon to a point, that in no case does the dark uadow of one planet reach the orbit of the next. iat of the Moon, however, sometimes falls upon the shn, - an< * l ^ at Earth upon the Moon, as DIAGRAM XXII. g W ' len the Moon passes between the Sun and the art h, the Sun is eclipsed to the inhabitants of those c