There are two other obelisks, which were in Cæsar’s Temple at Alexandria, near the harbour there, forty-two cubits in height, and originally hewn by order of King Mesphres. But the most difficult enterprise of all, was the carriage of these obelisks by sea to Rome, in vessels which excited the greatest admiration. Indeed, the late Emperor Augustus consecrated the one which brought over the first obelisk, as a lasting memorial of this marvellous undertaking, in the docks at Puteoli; but it was destroyed by fire. As to the one in which, by order of the Emperor Caius,[2550] the other obelisk had been transported to Rome, after having been preserved for some years and looked upon as the most wonderful construction ever beheld upon the seas, it was brought to Ostia, by order of the late Emperor Claudius; and towers of Puteolan[2551] earth being first erected upon it, it was sunk for the construction of the harbour which he was making there. And then, besides, there was the necessity of constructing other vessels to carry these obelisks up the Tiber; by which it became practically ascertained, that the depth of water in that river is not less than that of the river Nilus. The obelisk that was erected by the late Emperor Augustus in the Great Circus,[2552] was originally quarried by order of King Semenpserteus,[2553] in whose reign it was that Pythagoras[2554] visited Egypt. It is eighty-five feet[2555] and three quarters in height, exclusive of the base, which is a part of the same stone. The one that he erected in the Campus Martius, is nine feet less in height, and was originally made by order of Sesothis. They are both of them covered with inscriptions, which interpret the operations of Nature according to the philosophy of the Egyptians. CHAP. 15. (10.)—THE OBELISK WHICH SERVES AS A DIAL IN THE CAMPUS MARTIUS.