Admitting such an event to have happened which, however, may be considered as doubtful, the supposition involves in it this necessary consequence, that the stock of learning at that time must have been very confined. It is scarcely possible, otherwise, how one person, near the end of his reign, could have contrived to assemble together all the works of art and literature, dispersed through so large a tract of country and so enlightened as it was then supposed to be. There were, besides, other independent sovereigns in the country, over whom he had little or no controul, so that it is very probable the commonwealth of letters suffered no great loss by the burning of the Chinese books. When the Caliph Omar commanded the Alexandrian library to be destroyed, which the pride and the learning of the Ptolemy family had collected from every part of the world, literature sustained an irreparable loss; but, although the tyrant had the power to consign to eternal oblivion the works of science, yet he had no power over the principles upon which these works were constructed. These principles had spread themselves wide over the world. The expedition of Alexander carried the learning of the Egyptians and the Greeks into various countries of Asia, where they continued to flourish. And when the tyranny and oppression of the seventh Ptolemy (Physcon) forced the Alexandrians to abandon a city that was perpetually streaming with the blood of its citizens, they found an asylum in the Grecian states and in different parts of Asia. And as this sanguinary tyrant, in the midst of his cruelties, pretended and indeed shewed a fondness for literature, the arts and the sciences flourished even in his reign: the migrations, therefore, at this time, from the capital of Egypt, were of the greatest importance and use to those nations among whom the refugees settled. Unluckily for China, the wild mountainous forests towards the south, and the wide sandy deserts to the north, that render any communication extremely difficult between this empire and the rest of Asia, together with their dislike for foreigners, seem, at this time, to have checked the progress of those arts and sciences which had long flourished in Europe and in Africa. Their history, at least, is silent as to any communication with India, till a century nearly after the commencement of the Christian æra, when the religion of Budha found its way from Thibet into China.