If gold, or silver, or any other article, be brought up from the depth of eight cubits, the person who saves it shall receive one-third. If from fifteen cubits, the person who saves it shall, on account of the depth, receive one-half. If goods are cast up by the waves towards the shore, and found sunk at the depth of one cubit, the person who carries them out safe shall receive a tenth part.[1746] It was customary, moreover, in old times, to keep a number of divers on board ships for the purpose of descending to loosen the anchors when they chanced to take too firm a hold in the sand, as also to recover goods which had been thrown overboard in times of danger.[1747] ----- Footnote 1746: Beckmann, History of Inventions, i. 180. Footnote 1747: Lucian. Pharsal. iii. 697. Livius, xliv. 10. Manil. Astronom. 449. ----- On various headlands and promontories of the ancient world beacon-fires were habitually kindled to guide the course of the ships into port; and for these, in after ages, light-houses, adorned with every beauty of architecture, and carried to a vast height, were substituted. Of these the most remarkable was that erected for Ptolemy Philadelphus, by Sostratos, the Cnidian, whose name, by permission of the king, was inscribed upon the structure.[1748] By one author it is described as four hundred and fifty feet high, and equal in dimensions at the base to one of the great pyramids of Memphis. In form it may possibly have resembled the Haram el Kedâb, which consists of a series of square towers from the basement upwards, diminishing in size, and appearing to spring up out of each other. With this the language of Strabo[1749] very well agrees, since he tells us, it was a building consisting of numerous stages. On the summit bright fires were kept perpetually burning, so that on that low shore, where there is no hill or mountain for many days’ journey, the Pharos was ever the first object which presented itself to mariners at sea, where its light, we are told, was visible at the distance of a hundred miles. Occasionally, however, from its great size and brilliance, it was mistaken for the moon, as this planet itself, rising behind the dome and towers of a great capital, has suggested to distant beholders the idea of a conflagration.[1750] ----- Footnote 1748: Cf. Lucian. Quom. Hist. sit. Conscrib. § 62. Footnote 1749: Geograph. xvii. 1. t. iii. p. 423. Footnote 1750: Vossius, ad Pomp. Mel. de Situ Orb. l. ii. c. 4. p. 272. ----- CHAPTER XI. EXPORTS AND IMPORTS.