Not until our own day did these rubbish heaps attract attention, and it was reserved to our own generation, so interested in all that relates to the past, to recognize their true significance. Steenstrup noticed, in the north of Europe, that these mounds consisted nearly entirely of the shells of edible species, such as the oyster, mussel, and _littorina littorea_; that they were all those of adult specimens, but not all subject to similar conditions of existence or native to the same waters. The kitchen-middings, or heaps of kitchen refuse—such was the name given to these shell-mounds—could not have been the natural deposits left by the waves after storms, for in that case they would have been mixed with quantities of sand and pebbles. The conclusion is inevitable, that man alone could have piled up these accumulations, which were the refuse flung away day by day after his meals. The excavation of the kitchen-middings confirmed in a remarkable manner the opinion of Steenstrup, and everywhere a number of important objects were discovered. In several places the old hearths were brought to light. They consisted of flat stones, on which were piles of cinders, with fragments of wood and charcoal. It was now finally proved that these mounds occupied the site of ancient settlements, the inhabitants of which rarely left the coast, and fed chiefly on the mollusca which abounded in the waters of the North Sea. These primeval races, however savage they may have been, were not wanting in intelligence. The earliest inhabitants of Russia placed their dwellings near rivers above the highest flood-level known to or foreseen by them. The Scandinavians were most precise in the orientation of their homes, and M. de Quatrefages points out that the kitchen-midding of Sœlager is set against a hill in the best position for protecting those who lived near it from the north winds, which are so trying in these districts on account of their violence. At Havelse, says Sir John Lubbock, the settlement was on rather higher ground, and, though close to the shore, was quite beyond the reach of the waves. The English visitors had an excavation made whilst they were present, and in two or three hours they obtained about a hundred fragments of bone, many rude flakes, sling stones, and fragments of flint, together with some rough axes of the ordinary shell-mound type. The excavations at Meilgaard a little later by the same explorers were even more fruitful in results.