Watch it passing near the coast of Nova Scotia, and in the summer, not far from that of Newfoundland, where it has undoubtedly caused the formation of the well-known fishing-banks. This is the way they have been produced. When the summer sun releases the innumerable mighty icebergs which have been formed on the shores of the polar regions, they float away to the south, carried by a current which sets towards Newfoundland. They bear away with them vast quantities of rock, and stones, and sand. Meeting the hot water of the Gulf Stream, they quickly melt and deposit their burdens at the bottom, always about the same spot which you see marked as the Grand Bank. Now the stream, taking an easterly course, reaches the 40th degree of north latitude, when it begins to spread itself over the colder water of the ocean, washing the shores of Ireland; some going up towards Spitzbergen, surrounding the Shetland Isles, and other isles in the north; more rushing up the British Channel; and another quantity flowing into the Bay of Biscay, and away again towards the south--adding warmth to the whole of the indented shores of Europe, and at the same time supplying the deficiency of salt to the waters flowing out of the Baltic and the Polar basin." "Thank you, father," exclaimed Gerard; "I now understand why, when last year we made the voyage to New York, we kept away so far to the northward. It was to avoid the Gulf Stream, which would have been setting against us. But I say, father, I want to know why the water takes it into its head to flow in that way. I suppose there is some cause for it?"