It was about four o'clock that afternoon when our party first sighted the low, out-jutting sea-coast of Florida.  As they came slowly toward it, by reason of their angular course of approach, they could gradually make out a group of green palms here and there along the white stretches of sand, and see clusters of light-colored buildings, piers, shipping, and people moving about.  Thus they passed Juno and Palm Beach, and then saw the thicker cluster of fine dwellings of Miami itself, the most southerly city on the Florida mainland.