This terrific object seemed to recall the whole herd from their stationary fright. First, the whales forming the margin of our lake began to crowd a little, and tumble against each other, as if lifted by half spent billows from afar; then the lake itself began faintly to heave and swell; the submarine bridal-chambers and nurseries vanished; in more and more contracting orbits the whales in the more central circles began to swim in thickening clusters. Yes, the long calm was departing. A low advancing hum was soon heard; and then like to the tumultuous masses of block-ice when the great river Hudson breaks up in Spring, the entire host of whales came tumbling upon their inner centre, as if to pile themselves up in one common mountain. Instantly Starbuck and Queequeg changed places; Starbuck taking the stern.