of his arm operating as a centripetal power, and the bucket, which was a substitute for the earth, describing a circular orbit round about the globular head and ruby visage of Professor Von Poddingcoft, which formed no bad representation of the sun.  All of these particulars were duly explained to the class of gaping students around him.  He apprised them, moreover, that the same principle of gravitation which retained the water in the bucket restrains the ocean from flying from the earth in its rapid revolutions; and he farther informed them that should the motion of the earth be suddenly checked, it would incontinently fall into the sun, through the centripetal force of gravitation:  a most ruinous event to this planet, and one which would also obscure, though it most probably would not extinguish, the solar luminary.  An unlucky stripling, one of those vagrant geniuses who seem sent into the world merely to annoy worthy men of the puddinghead order, desirous of ascertaining the correctness of the experiment, suddenly arrested the arm of the professor just at the moment that the bucket was in its zenith, which immediately descended with astonishing precision upon the philosophic head of the instructor of youth.  A hollow sound, and a red-hot hiss, attended the contact; but the theory was in the amplest manner illustrated, for the unfortunate bucket perished in the conflict; but the blazing countenance of Professor Von Poddingcoft emerged from amidst the waters, glowing fiercer than ever with unutterable indignation, whereby the students were marvelously edified, and departed considerably wiser than before.

It is a mortifying circumstance, which greatly perplexes many a painstaking philosopher, that nature often refuses to second his most profound and elaborate efforts; so that often after having invented one of the most ingenious and natural theories imaginable, she will have the perverseness to act directly in the teeth of his system, and flatly contradict his most favorite positions.  This is a manifest and unmerited grievance, since it throws the censure of the vulgar and unlearned entirely upon the philosopher; whereas the fault is not to be ascribed to his theory, which is unquestionably correct, but to the waywardness of Dame Nature, who, with the proverbial fickleness of her sex, is continually indulging in coquetries and caprices, and seems really to take pleasure in violating all philosophic rules, and jilting the most learned and indefatigable of her adorers.  Thus it happened with respect to the foregoing satisfactory explanation of the motion of our planet; it appears that the centrifugal force has long since ceased to operate, while its antagonist remains in undiminished potency:  the world, therefore, according to the theory as it originally stood, ought in strict propriety to tumble into the sun; philosophers were convinced that it would do so, and awaited in anxious impatience the fulfillment of their prognostics.  But the