Leaving the island of Cuba the travellers proceeded in a S.S.E. direction, and on the morning of the 17th approached the group of the Little Caymans, in the neighbourhood of which they saw numerous turtles of extraordinary size, accompanied by multitudes of sharks. Passing a second time over the great bank of Vibora, they remarked that the colour of the troubled waters upon it was of a dirty-gray, and made observations on the changes of temperature at the surface produced by the varying depth of the sea. On quitting this shoal they sailed between the Baxo Nueva and the lighthouse of Camboy. The weather was remarkably fine, and the surface of the bay was of an indigo-blue or violet tint, on account of the medusæ which covered it. Haloes of small dimensions appeared round the moon. The disappearance of one of them was followed by the formation of a great black cloud, which emitted some drops of rain; but the sky soon resumed its serenity, and a long series of falling-stars and fire-balls were seen moving in a direction contrary to the wind in the lower regions of the atmosphere, which blew from the north. During the whole of the 23d March not a single cloud was seen in the firmament, although the air and the horizon were tinged with a fine red colour; but towards evening large bluish clouds formed, and when they disappeared, converging bands of fleecy vapours were seen at an immense height.