Already the sun was sinking behind the tree-tops of Lower Metacumba, fish were leaping in the placid waters, and a few pelican were soaring with steady poise above them. Every now and then these would swoop swiftly down, with a heavy splash that generally sealed the fate of one or more mullet off which the great birds were making their evening meal. A flock of black cormorants, uttering harsh cries, flew overhead with a rushing sound, returning from a day's fishing to their roosts in the distant Everglades. With these exceptions, and the faint boom of the surf on the outer reef, all was silence and desertion. Besides the light-house tower there was no sign of human life, not even the distant glimmer of a sail. While the boys still looked longingly for some trace of their canoes, the sunset, and a red flash, followed at short intervals by two white ones, shot out from the vanishing form of Alligator Light.