With a few remarks upon the Earth's Satellite, we conclude the first Lecture on Astronomy; the remainder of the course being contained in a second Lecture, treating of the planets, Mars, Jupiter, Saturn and Neptune, the Asteroids, and the fixed stars, which last, being "fixings," are, according to Mr. Charles Dickens, American property. THE MOON This resplendent luminary, like a youth on the Fourth of July, has its first quarter; like a ruined spendthrift its last quarter, and like an omnibus, is occasionally full and new. The evenings on which it appears between these last stages are beautifully illumined by its clear, mellow light. The Moon revolves in an elliptical orbit about the Earth in twenty-nine days twelve hours forty-four minutes and three seconds, the time which elapses between one new Moon and another. It was supposed by the ancient philosophers that the Moon was made of green cheese, an opinion still entertained by the credulous and ignorant. Kepler and Tyco Brahe, however, held to the opinion that it was composed of Charlotte Russe, the dark portions of its surface being sponge cake, the light _blanc mange_. Modern advances in science and the use of Lord Rosse's famous telescope have demonstrated the absurdity of all these speculations by proving conclusively that the Moon is mainly composed of the _Ferro_--_sesqui_--_cyanuret, of the cyanide of potassium_! Up to the latest dates from the Atlantic States, no one has succeeded in reaching the Moon. Should anyone do so hereafter, it will probably be a woman, as the sex will never cease making an exertion for that purpose as long as there is a man in it. Upon the whole, we may consider the Moon an excellent institution, among the many we enjoy under a free, republican form of government, and it is a blessed thing to reflect that the President of the United States can not _veto_ it, no matter how strong an inclination he may feel, from principle or habit, to do so. It has been ascertained beyond a doubt that the Moon has no air. Consequently, the common expressions, "the Moon was gazing down with an air of benevolence," or with "an air of complacency," or with "an air of calm superiority," are incorrect and objectionable, the fact being that the Moon has no air at all. The existence of the celebrated "Man in the Moon" has been frequently questioned by modern philosophers. The whole subject is involved in doubt and obscurity. The only authority we have for believing that such an individual exists, and has been seen and spoken with, is a fragment of an old poem composed by an ancient Astronomer of the name of Goose, which has been handed down to us as follows: "The man in the Moon came down too soon To inquire the way to Norwich; The man in the South, he burned his mouth, Eating cold, hot porridge."