No history of Grace Darling would be complete that did not contain some reference to lighthouses; since it was in one of them that she lived, and in association with it that her thrilling deeds were done. The lighthouse is not a modern invention, though modern science and art have brought it to its present state of perfection. The beacon-fire was known to the ancients, and the fire-towers of the Mediterranean were justly celebrated. The first regular light seems to have been placed at the entrance to the Hellespont; but of greater notoriety was the large tower on the island of Pharos, off Alexandria, which was so ingeniously constructed that it has been a model for many a modern lighthouse. Some incredible stories are told about this light, which, it is said, could be seen over the sea for a distance of thirty-four miles! Edrisi thus describes it:--"This pharos has not its like in the world for skill of construction and solidity. It is built of excellent stones, of the kind called Kedan, the layers of which are united by molten lead, and the joints are so adherent that the whole is indissoluble, though the waves of the sea from the north incessantly beat against it. This edifice is singularly remarkable, as much on account of its height as of its massiveness: it is of exceeding utility, because its fire burns night and day for the guidance of navigators, and is visible at the distance of a day's sail. During the night, it shines like a star: by day, you may distinguish its smoke." There was a remarkable pharos built at Ostia by the Emperor Claudius, which was erected on an artificial breakwater. Then there was the light of Puteoli, which, in the far-away days of Rome, was of service to the seamen who were seeking to enter the port. Augustus, who provided the harbour of Ravenna, enriched it with a light. Charybdis and Scylla had also their warning beacon, and Caprera too lifted its light to save ancient vessels from destruction. There was also the Timian Tower, which was erected for navigators, but its design was frustrated by wreckers, who lighted other fires, in order to mislead the seamen, and lure them to ruin and death.