Numbers of valuable works perished in a vast conflagration of books, and the only wonder is that any were preserved, with the exception of the three classes specified above. In 210 B.C. the First Emperor died, and his youngest son was placed upon the throne with the title of Second Emperor. The latter began by carrying out the funeral arrangements of his father, as described about a century later by the first and greatest of China's historians:-- "On the 9th moon the First Emperor was buried in Mount Li, which in the early days of his reign he had caused to be tunnelled and prepared with that view. Then, when he had consolidated the empire, he employed his soldiery, to the number of 700,000, to bore down to the Three Springs (that is, until water was reached), and there a firm foundation was laid and the sarcophagus placed thereon. Rare objects and costly jewels were collected from the palaces and from the various officials, and were carried thither and stored in huge quantities. Artificers were ordered to construct mechanical crossbows, which, if any one were to enter, would immediately discharge their arrows. With the aid of quicksilver, rivers were made--the Yangtsze, the Yellow River, and the great ocean--the metal being made to flow from one into the other by machinery. On the roof were delineated the constellations of the sky, on the floor the geographical divisions of the earth. Candles were made from the fat of the man-fish (walrus), calculated to last for a very long time. The Second Emperor said: 'It is not fitting that the concubines of my late father who are without children should leave him now;' and accordingly he ordered them to accompany the dead monarch into the next world, those who thus perished being many in number. When the internment was completed, some one suggested that the workmen who had made the machinery and concealed the treasure knew the great value of the latter, and that the secret would leak out. Therefore, so soon as the ceremony was over, and the path giving access to the sarcophagus had been blocked up at its innermost end, the outside gate at the entrance to this path was let fall, and the mausoleum was effectually closed, so that not one of the workmen escaped. Trees and grass were then planted around, that the spot might look like the rest of the mountain."