VERY little is known about the sleep of whales. They seldom sleep at the surface. Scoresby, speaking of the Greenland whale, says: 'Whales are seldom found sleeping, yet instances occasionally occur, in calm weather, amongst ice.' I have in my possession a large number of log-books of whaling voyages to the Greenland Sea and do not find a single example recorded. The recently published log-books of Capt. Scoresby, senior, tell the same tale.