and chemical manifestations, brought it? To speculation generally—mere soap‐bubbles, that have burst one after the other before the men of Science were permitted to discover real facts. All this would have been avoided, and the progress of knowledge would have proceeded with gigantic strides, had only Science and its philosophy abstained from accepting hypotheses merely on the one‐sided knowledge of _their_ “matter.” The behaviour of Uranus and Neptune—whose satellites, four and one in number respectively, revolved, it was thought, in their orbits from East to West, whereas all the other satellites rotate from West to East—is a very good instance, as showing how unreliable are all _à priori_ speculations, even when based on the strictest mathematical analysis. The famous hypothesis of the formation of our Solar System out of nebulous rings, put forward by Kant and Laplace, was chiefly based on the assumed fact that all the planets revolved in the same direction. Laplace, relying on this mathematically demonstrated fact in his own time, and calculating on the theory of probabilities, offered to bet three milliards to one that the next planet discovered would have in its system the same peculiarity of motion eastward. The immutable laws of scientific mathematics got “worsted by further experiments and observations.” This idea of Laplace’s mistake prevails generally to this day; but some Astronomers have finally succeeded in demonstrating (?) that the error has been in accepting Laplace’s assertion for a mistake; and steps to correct the _bévue_, without attracting general attention, are now being taken. Many such unpleasant surprises are in store for hypotheses of even a purely physical character. What further disillusions, then, may there not be in questions concerning a transcendental, Occult Nature? At any rate, Occultism teaches that the so‐called “reverse rotation” is a fact.