hundreds of years have been found imbedded in ice and so thoroughly preserved that their flesh was actually consumed by the dogs of the present day; and it is not a rare occurrence to find in mossy bogs, such as those in Ireland, the bodies of human beings, that have become accidentally buried in them centuries ago, completely mummified by the preservative influence of the matrix in which they have been entombed. In short, these preservative qualities in nature are analogous to our artificial processes of pickling, embalming, or refrigerating, and had it not been for their occasional occurrence naturally, neither the science of geology nor that of prehistoric archæology would have much chance of being called into existence; nor could we now have any knowledge of the consecutive series of animals and plants that have inhabited this globe prior to the few centuries to which our historical records extend. That these facts have failed to draw attention to lacustrine and other alluvial deposits as rich repositories of the remains of prehistoric man in Europe till about a quarter of a century ago, is more remarkable when we consider that ancient authors are not altogether silent on the habit prevailing among some races of erecting wooden abodes in lakes and marshes; that the Swiss lake villages, though singularly enough unnoticed by historians, were occupied as late as the Roman period; that frequent references have been made in the Irish annals to the stockaded islands, or as they are here called Crannoges, as existing in Ireland down to the Middle Ages; and that a similar custom is now found to be prevalent amongst some of the ruder races of mankind in various parts of the globe. Hippocrates (_De Aeribus_, xxxvii.) speaks of the people in the Phasis, who live in the marshes, and have houses of timber and reeds constructed in the midst of the waters, to which they sail in single tree canoes. Herodotus (v. 16) also describes the dwellers upon the lake Prasias, whose huts were placed on platforms supported by tall piles in the midst of the lake, with a narrow bridge as an approach, and who, on one occasion, successfully resisted the military resources of a Persian army. Villages composed of pile-dwellings are numerous along the shores of the Gulf of Maracaibo. "The positions chosen for their erections are near the mouths of rivers and in shallow waters. The piles on which they rest are driven deep into the oozy bottom, and so firmly do they hold that there is no shakiness of the loftily-perched dwelling perceptible, even when crowded with people.... Similar dwellings are found in other parts of South America, about the mouths of the Orinoco and the Amazons. They are the invention, not exactly of savages, but of tribes of men in a very primitive stage of culture."--(_Illustrated Travels_, vol. ii. pp. 19-21.)