came the birds, the mammals,—the varied types of animal life which we now know. Last in the scale of time and highest in point of evolution, there appeared man.

We must not speak of the continents as having been made once and for all in their present form. No doubt in the countless centuries of geological evolution various parts of the earth were alternately raised and depressed. Great forests grew, and by some convulsion were buried beneath the ocean, covered deep as they lay there with a sediment of earth and rock, and at length raised again as the waters retreated. The coal-beds of Cape Breton are the remains of a forest buried beneath the sea. Below the soil of Alberta is a vast jungle of vegetation, a dense mass of giant fern trees. The Great Lakes were once part of a much vaster body of water, far greater in extent than they now are. The ancient shore-line of Lake Superior may be traced five hundred feet above its present level.

In that early period the continents and islands which we now see wholly separated were joined together at various points. The British islands formed a connected part of Europe. The Thames and the Rhine were one and the same river, flowing towards the Arctic ocean over a plain that is now the shallow sunken bed of the North Sea. It is probable that during the last great age, the Quaternary, as geologists call it, the upheaval of what is now the region of Siberia and Alaska, made a continuous chain of land from Asia to America. As the land was depressed again it left behind it the islands in the Bering Sea, like stepping-stones from shore to shore. In the same way, there was perhaps a solid causeway of land from Canada to Europe reaching out across the Northern Atlantic. Baffin Island and other islands of the Canadian North Sea, the great sub-continent of Greenland, Iceland, the Faroe Islands, and the British Isles, all formed part of this continuous chain.

As the last of the great changes, there came the Ice Age, which profoundly affected the climate and soil of Canada, and, when the ice retreated, left its surface much as we see it now. During this period the whole of Canada from the Atlantic to the Rocky Mountains lay buried under a vast sheet of ice. Heaped up in immense masses over the frozen surface of the Hudson Bay country, the ice, from its own dead weight, slid sidewise to the south. As it went it ground down the surface of the land into deep furrows and channels; it cut into the solid rock like a moving plough, and carried with it enormous masses of loose stone and boulders which it threw broadcast over the face of the country. These stones and boulders were thus carried forty and fifty, and in some cases many hundred miles before they were finally loosed and dropped from the sheet of moving ice. In Ontario and Quebec and New England great stones of the glacial drift are found which weigh from one thousand to seven thousand tons. They are deposited in some cases on what is now the summit of hills and mountains, showing how deep the sheet of ice must have been that could thus cover the entire surface of the country, burying alike the valleys and the hills. The mass of ice that moved slowly, century by century, across the face of Southern Canada to New England is estimated to have been in places a mile thick. The limit to which it was carried went far south of the boundaries of Canada. The path of the glacial drift is traced by geologists as far down the Atlantic coast as the present site of New York, and in the central plain of the continent it extended to what is now the state of Missouri.

Facts seem to support the theory that before the Great Ice Age the climate of the northern part of Canada was very different from what it is now. It is very probable that a warm if not a torrid climate extended for hundreds of miles northward of the now habitable limits of the Dominion. The frozen islands of the Arctic seas were once the seat of luxurious vegetation and teemed with life. On Bathurst Island, which lies in the latitude of 76 degrees, and is thus six hundred miles north of the Arctic Circle, there have been found the bones of huge lizards that could only have lived in the jungles of an almost tropical climate.

We cannot tell with any certainty just how and why these great changes came about. But geologists have connected them with the alternating rise and fall of the surface of the northern continent and its altitude at various times above the level of the sea. Thus it seems probable that the glacial period with the ice sheet of which we have spoken was brought about by a great elevation of the land, accompanied by a change to intense cold. This led to the formation of enormous masses of ice heaped up so high that they presently collapsed and moved of their own weight from the elevated land of the north where they had been formed. Later on, the northern continent subsided again and the ice sheet disappeared, but left behind it an entirely different level and a different climate from those of the earlier ages. The evidence of the later movements of the land surface, and its rise and fall after the close of the glacial epoch, may still easily be traced. At a certain time after the Ice Age, the surface sank so low that land which has since been lifted up again to a considerable height was once the beach of the ancient ocean. These beaches are readily distinguished by the great quantities of sea shells that lie about, often far distant from the present sea. Thus at Nachvak in Labrador there is a beach fifteen hundred feet above the ocean. Probably in this period after the Ice Age the shores of Eastern Canada had sunk so low that the St Lawrence was not a river at all, but a great gulf or arm of the sea. The ancient shore can still be traced beside the mountain at Montreal and on the hillsides round Lake Ontario. Later on again the land rose, the ocean retreated, and the rushing waters from the shrunken lakes made their own path to the sea. In their foaming course to the lower level they tore out the great gorge of Niagara, and tossed and buffeted themselves over the unyielding ledges of Lachine.

Mighty forces such as these made and fashioned the continent on which we live.

CHAPTER II

MAN IN AMERICA

It was necessary to form some idea, if only in outline, of the magnitude and extent of the great geological changes of which we have just spoken, in order to judge properly the question of the antiquity and origin of man in America.

When the Europeans came to this continent at the end of the fifteenth century they found it already inhabited by races of men very different from themselves. These people, whom they took to calling 'Indians,' were spread out, though very thinly, from one end of the continent to the other. Who were these nations, and how was their presence to be accounted for?

To the first discoverers of America, or rather to the discoverers of the fifteenth and sixteenth centuries (Columbus and his successors), the origin of the Indians presented no difficulty. To them America was supposed to be simply an outlying part of Eastern Asia, which had been known by repute and by tradition for centuries past. Finding, therefore, the tropical islands of the Caribbean sea with a climate and plants and animals such as they imagined those of Asia and the Indian ocean to be, and inhabited by men of dusky colour and strange speech, they naturally thought the place to be part of Asia, or the Indies. The name 'Indians,' given to the aborigines of North America, records for us this historical misunderstanding.

But a new view became necessary after Balboa had crossed the isthmus of Panama and looked out upon the endless waters of the Pacific, and after Magellan and his Spanish comrades had sailed round the foot of the continent, and then pressed on across the Pacific to the real Indies. It was now clear that America was a different region from Asia. Even then the old error died hard. Long after the Europeans realized that,