[82] Such as the destruction of the Alexandrine Library on three distinct occasions, (1) upon the conquest of Alexandria by Julius Cæsar, B.C. 48; (2) in A.D. 390; and, (3) by Amrou, the general of the Caliph Omar, in 640, who ordered it to be burnt, and so supplied the baths with fuel for six months. Again, the destruction of all Chinese books by order of Tsin Shi Hwang-ti, the founder of the Imperial branch of the Tsin dynasty, and the first Emperor of United China; the only exceptions allowed being those relating to medicine, divination, and husbandry. This took place in the year 213 B.C. [83] The Chinese have used composite blocks (wood engraved blocks with many characters, analogous to our stereotype plates) from an early period. May not the brick-clay tablets preserved in the Imperial Library at Babylon have been used for striking off impressions on some plastic material, just as rubbings may be taken from the stone drums in China: may not the cylinders with inscribed characters have been used in some way or other as printing-rollers for propagating knowledge or proclamations? [84] As, for example, the old canal from the Nile to the Red Sea, in reference to which Herodotus says (_Euterpe_, 158), "Neco was the son of Psammitichus, and became King of Egypt: he first set about the canal that leads to the Red Sea, which Darius the Persian afterwards completed. Its length is a voyage of four days, and in width it was dug so that two triremes might sail rowed abreast. The water is drawn into it from the Nile, and it enters it a little above the city Bubastis, passes near the Arabian city Patumos, and reaches to the Red Sea." In the digging of which one hundred and twenty thousand Egyptians perished in the reign of Neco. [85] The co-called tanks at Aden, reservoirs constructed one below the other, in a gorge near the cantonments, are as perfect now as they were when they left the hand of the contractor or royal engineer in the time of Moses. [86] In the 29th year of the Emperor Kwei [B.C. 1559] they chiselled through mountains and tunnelled hills, according to the Bamboo Books. [87] An interesting line of investigation might be opened up as to the origin of inventions and the date of their migrations. The Chinese claim the priority of many discoveries, such as chess, printing, issue of bank-notes, sinking of artesian wells, gunpowder, suspension bridges, the mariner's compass, &c. &c. I extract two remarkable wood-cuts from the _San Li T'u_, one appended here showing the origin of our college cap; the other, in the chapter on the Unicorn, appearing to illustrate the fable of the Sphynx. [Illustration: FIG. 22.--ROYAL DIADEM OF THE CHEN DYNASTY. (_From the San Li T'u._)] I also give a series of engravings, reduced facsimiles of those contained in a celebrated Chinese work on antiquities, showing the gradual evolution of the so-called Grecian pattern or scroll ornamentation, and origination of some of the Greek forms of tripods.