The Complete Works of Edgar Allan Poe - Edgar Allan Poe [930]
But there is one point, in especial, which should have instantly betrayed the fiction. Let us imagine the power really possessed of seeing animals on the moon’s surface — what in such case would first arrest the attention of an observer from the earth? Certainly neither the shape, size, nor any other peculiarity in these animals so soon as their remarkable position — they would seem to be walking heels up and head down, after the fashion of flies on a ceiling. The real observer (however prepared by previous knowledge) would have commented on this odd phenomenon before proceeding to other details; the fictitious observer has not even alluded to the subject, but in the case of the man-bats speaks of seeing their entire bodies, when it is demonstrable that he could have seen little more than the apparently flat hemisphere of the head.
I may as well observe, in conclusion, that the size, and especially the powers of the man-bats, (for example, their ability to fly in so rare an atmosphere — if, indeed, the moon has any,) with most of the other fancies in regard to animal and vegetable existence, are at variance generally with all analogical reasoning on these themes, and that analogy here will often amount to the most positive demonstration. The temperature of the moon, for instance, is rather above that of boiling water, and Mr. Locke, consequently, has committed a serious oversight in not representing his man-bats, his bisons, his game of all kinds — to say nothing of his vegetables — as each and all done to a turn.
It is, perhaps, scarcely necessary to add, that all the suggestions attributed to Brewster and Herschell in the beginning of the hoax, about the “transfusion of artificial light through the focal object of vision,” etc., etc., belong to that species of figurative writing which comes most properly under the head of rigmarole. There is a real and very definite limit to optical discovery among the stars, a limit whose nature need only be stated to be understood. If, indeed, the casting of large lenses were all that is required, the ingenuity of man would ultimately prove equal to the task, and we might have them of any size demanded; but, unhappily, in proportion to the increase of size in the lens, and consequently of space-penetrating power, is the diminution of light from the object by diffusion of the rays. And for this evil there is no remedy within human reach; for an object is seen by means of that light alone, whether direct or reflected, which proceeds from the object itself. Thus the only artificial light which could avail Mr. Locke, would be such as he should be able to throw, not upon “the focal object of vision,” but upon the moon. It has been easily calculated that when the light proceeding from a heavenly body becomes so diffused as to be as weak as the natural light given out by the stars collectively in a clear, moonless night, then the heavenly body for any practical purpose is no longer visible.
The singular blunders to which I have referred being properly understood, we shall have all the better reason for wonder at the prodigious success of the hoax. Not one person in ten discredited it, and (strangest point of all!) the doubters were chiefly those who doubted without being able to say why — the ignorant, those uninformed in astronomy, people who would not believe because the thing was so novel, so entirely “out of the usual way.” A grave professor of mathematics in a Virginian college told me seriously that he had no doubt of the truth of the whole affair! The great effect wrought upon the public mind is referable, first, to the novelty of the idea; secondly, to the fancy-exciting and reason-repressing character of the alleged discoveries; thirdly, to the consummate tact with which the deception was brought forth; fourthly, to the exquisite vraisemblance of the narration. The hoax was circulated to an immense extent, was translated into various languages