The foregoing facts do not seem to show that the ancients had merely “some knowledge of optics.” Therefore, totally disagreeing in this particular with Professor Fiske and his criticism of Professor Draper’s Conflict in his Unseen World, the only fault we find with the admirable book of Draper is that, as an historical critic, he sometimes uses his own optical instruments in the wrong place. While, in order to magnify the atheism of the Pythagorean Bruno, he looks through convex lenses; when-

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ever talking of the knowledge of the ancients, he evidently sees things through concave ones.

It is simply worthy of admiration to follow in various modern works the cautious attempts of both pious Christians and skeptical, albeit very learned men, to draw a line of demarcation between what we are and what we are not to believe, in ancient authors. No credit is ever allowed them without being followed by a qualifying caution. If Strabo tells us that ancient Nineveh was forty-seven miles in circumference, and his testimony is accepted, why should it be otherwise the moment he testifies to the accomplishment of Sibylline prophecies? Where is the common sense in calling Herodotus the “Father of History,” and then accusing him, in the same breath, of silly gibberish, whenever he recounts marvellous manifestations, of which he was an eye-witness? Perhaps, after all, such a caution is more than ever necessary, now that our epoch has been christened the Century of Discovery. The disenchantment may prove too cruel for Europe. Gunpowder, which has long been thought an invention of Bacon and Schwartz, is now shown in the school-books to have been used by the Chinese for levelling hills and blasting rocks, centuries before our era. “In the Museum of Alexandria,” says Draper, “there was a machine invented by Hero, the mathematician, a little more than 100 years B.C. It revolved by the agency of steam, and was of the form that we should now call a reaction-engine. . . . Chance had nothing to do with the invention of the modern steam-engine.” Europe prides herself upon the discoveries of Copernicus and Galileo, and now we are told that the astronomical observations of the Chaldeans extend back to within a hundred years of the flood; and Bunsen fixes the flood at not less than 10,000 years before our era. Moreover, a Chinese emperor, more than 2,000 years before the birth of Christ (i.e., before Moses) put to death his two chief astronomers for not predicting an eclipse of the sun.

It may be noted, as an example of the inaccuracy of current notions as to the scientific claims of the present century, that the discoveries of the indestructibility of matter and force-correlation, especially the latter, are heralded as among our crowning triumphs. It is “the most important discovery of the present century,” as Sir William Armstrong expressed it in his famous address as president of the British Association. But, this “important discovery” is no discovery after all. Its origin, apart from the undeniable traces of it to be found among the old philosophers, is lost in the dense shadows of prehistoric days. Its first vestiges are dis-

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covered in the dreamy speculations of Vedic theology, in the doctrine of emanation and absorption, the nirvana in short. John Erigena outlined it in his bold philosophy in the eighth century, and we invite any one to read his De Divisione Naturae, who would convince himself of this truth. Science tells that when the theory of the indestructibility of matter (also a very, very old idea of Demokritus, by the way) was demonstrated, it became necessary to extend it to force. No material particle can ever be lost; no part of the force existing in nature can vanish; hence, force was likewise proved indestructible, and its various manifestations or forces, under divers aspects, were shown to be mutually convertible, and but different modes of motion of the material particles. And thus was rediscovered the force-correlation. Mr. Grove, so far back as 1842, gave to each of these forces, such as heat, electricity, magnetism, and light, the character of convertibility; making them capable of being at one moment a cause, and at the next an effect. But whence come these forces, and whither do they go, when we lose sight of them? On this point science is silent.