Moon is a spherical world, having hills and dales like the earth, can only see such things in imagination. “Nothing but unmeaning figures” are really visible, and “the students break off in disappointment, and have their faith in such things rather diminished than increased,” “until they previously learn from _drawings_ and explanations how to _interpret_ everything seen.” But who _first made_ the drawings? Who _first interpreted_ the “unmeaning figures” and the “confused mass of light and shade?” Who first declared them to indicate mountains and valleys, and ventured to make drawings and give explanations and interpretations for the purpose of biasing the minds, and fixing or guiding the imaginations of subsequent observers? Whoever they were, they at least had “given the reins to Fancy,” and afterwards took upon themselves to dogmatise and teach their crude and unwarranted imaginings to succeeding investigators. And this is the kind of evidence and “reasoning” which is obtruded in our seats of learning, and spread out in the numerous works which are published for the edification of society! [31] “Mechanism of the Heavens,” by Denison Olmsted, LL.D., Professor of Natural Philosophy and Astronomy in Gale College, U.S. [32] Mitchell’s “Orbs of Heaven,” p. 232. THE PLANET NEPTUNE.--For some years the advocates of the earth’s rotundity, and of the Newtonian philosophy generally, were accustomed to refer with an air of pride and triumph to the discovery of a new planet, which was called Neptune, as an undeniable evidence of the truth of their system or theory. The existence of this luminary was said to have been predicated from calculation only, and for a considerable period before it had been seen by the telescope. It was urged that therefore the system which would permit of such a discovery must be true. But the whole matter subsequently proved to be unsatisfactory. That a proper conception may be formed of the actual value of the calculations and their supposed verification, the following account will be useful. “In the year 1781, on March 13, Uranus was discovered by Sir William Herschel, who was examining some small stars near the feet of Gemini; and he observed one of them to have a sensible amount of diameter and less brightness than the others, and it was soon found to be a planet. It, however, had been seen before--first, by Flamstead, on December 23rd, 1690; and between this time and 1781 it had been observed 16 times by Flamstead, Bradley, Mayer, and Lemonnier; these astronomers had classed it as a star of the sixth magnitude. Between 1781 and 1820 it was of course very frequently observed; and it was hoped that at the latter time sufficient data existed to construct accurate tables of its motions. This task was undertaken by M. Bouvard, Member _de L’Academie des Sciences_, but he met with unforeseen difficulties. It was found utterly impossible to construct tables which would represent the 17 ancient observations,