It is even possible to have a berg as high out of water as it is deep below the surface, for if we imagine a large, solid lump, of any regular shape, which has a very small, sharp, high pinnacle in the centre, the height above water can easily be equal to the depth below. An authentic case on record is that of a berg grounded in the Strait of Belle Isle, in sixteen fathoms of water, that had a thin spire about one hundred feet in height. Each glacier in Greenland, so far as any estimate has been made, is the parent each year of from ten to one hundred icebergs. When these bergs have plunged into the Arctic Sea, they are picked up by the Arctic current and begin their journey to the North Atlantic. But there are thousands of them afloat; they crowd and rub against each other and frequently they break into smaller masses. Many go aground in the Arctic basin; others get to the shores of Labrador, where from one end to the other they continually ground and float. Some disappear there, while others get safely past and reach the Grand Banks. According to Ensign Rodman, the ice of bergs, although very hard, is at the same time extremely brittle. A blow of an axe will at times split them, and the report of a gun, by concussion, will accomplish the same end. They are more apt to break up in warm weather than in cold, and whalers and sealers note this before landing on them when an anchor is to be planted or fresh water to be obtained. On the coast of Labrador, in July and August, when it is packed with bergs, the noise of rupture is often deafening, and those experienced in ice give them a wide berth. When they are frozen the temperature is very low, so that when their surface is exposed to a thawing temperature the tension of the exterior and interior is very different, making them not unlike a Prince Rupert's drop. Then, too, during the day, the water made by melting finds its way into the crevices, freezes, and hence expands, and, acting like a wedge, forces the berg into fragments. Much of the ice encountered at sea is discolored, and often full of dirt and gravel, while not infrequently stones are found imbedded in it. Along the shores of Labrador, where there is a large rise and fall in the tide, ice is brought into contact with the bottom, and mud and sea-weed are frozen in with it, while at times landslides precipitate large quantities of dirt and stones on its surface. As the ice leaves the coast and comes to the southward, it brings these burdens with it, which are deposited on the ocean bottom when the ice melts. As this melting occurs to a great extent over the Grand Banks, it would seem that the deposit from the field ice would be greater than that from bergs. It is hard to understand why bergs should have foreign substances frozen into them, as they are formed from snow deposited on the frozen surfaces in the interior of Greenland, and hence their thickness is added to from their upper surface.