Location of Human is doubtful if any relics of human art have ever been discovered in the undisturbed moraines of the great Glacial Age. Such claims have indeed been advanced for several finds in Sweden, as that at Yoldia on the west coast and at Jaravall in the province of Scania. But it has been pointed out by M. Otto Torell that in both these, as well as in all similar instances, the relics were decidedly in advance of the culture of the Palreolithic Age, and therefore undoubt edly belonged to later, so-called "intrusive" deposits.
Interglacial and Postglacial in fact, could not have lived upon the ice-sheet itself, and even were the habitable land well peopled at the time we should not expect to find art-remains in the moraines. When, however, the ice-sheet melted and its borders receded to the north, the hunting and fishing tribes would follow it up, and might leave relics of their industries in the soil, which a second glacier would cover with its till. Discoveries of stone implements in such interglacial strata have been reported by various observers. Again, when the glacier melted it would swell the watercourses and pour down mighty torrents of turbid water freighted with mud, sand, and stones. These form the "postglacial gravels," in which numerous remains of human industry occur, and which offer a rich field for the student of Prehistoric Archaeology. In such
interglacial and postglacial deposits are found the earliest traces of man in the 'Western Hemisphere.
Jfeaninir of the Term may be well, however, to say some thing about what is to be understood by this term man. Some writers, who are more interested in refinements of speech than in the ascertaining of facts, have taken exception to the application of this word to an animal to which are denied the sentiment of religion and the power of language. To such critics we may quote the words of Darwin: "Whether primeval man, when he possessed but few arts, and those of the rudest kind, and when his power of language was extremely imperfect, would have deserved to be called man, must depend on the definition which we employ. In a series of forms graduating insensibly from some ape-like creature to man as he now exists, it would be impossible to fix on any definite point where the term man ought to be used. But this is a matter of very little import ance." Fully agreeing with him as to the small importance of this point, we shall in this work employ the term man as appropriate to that species the members of which alone of animals have in all time been acquainted with the use of fire and known how to manufacture tools.