All eyes were now turned towards the bank of cloud, which was rising with extraordinary rapidity. Small portions of the upper line seemed at times to be torn off and to rush ahead of the main body, and then to disappear, suddenly blown into fragments. A low moaning sound was heard, and a line of white could be made out at the foot of the cloud-bank. The water around the ship was still as smooth as glass, though there was a slight swell, which swayed her to and fro, and caused the shrouds and blocks to rattle.