swept into Mexico from the Northwest about the twelfth century. The sanguinary horde partly destroyed and partly seized for its own use the civilization of the Toltecans. We have specially to do with an Aztec wave that seems to have surged up the valley of the Mississippi. As the great conquering people captured one region, they would settle upon it, and send off a new hive of marauders. Indian tribes, numerous but of the same savage type, are marked by the old Geographers as occupying the Mississippi valley. It was when one part of the northern horde came up the valley of the Ohio, as the Savage Iroquois, and another up the head waters of the Mississippi as the Sioux, the tigers of the plains, that we became familiar in the sixteenth century with this race. The French recognized the Sioux as the same race as the Iroquois and called them "Iroquets" or little Iroquois. The two nations were confederate in their form of government; they had all the fury of Aztecs, and resemblances of a sufficiently marked kind are found between Sioux or Dakota and the Iroquois dialect, while their skulls follow the Dolichocephalic type of cranium. With fire and sword the invaders swept away the Toltecs; their mines were deserted and filled up with debris; their arts of agriculture, metal working and pottery making were lost; and up to the extreme limits of our country of the Takawgamis, only the mounds and their contents were left. OUR HISTORIC ERA saw the expiring blaze of this tremendous conflagration just as the French arrived in Canada. Cartier saw a race in 1535 in Hochelaga, who are believed to have had Brachycephalic crania, who were agriculturists, used at least implements of metal, dwelt in large houses, made pottery and were constructive in tendency. In 1608 when Champlain visited the same spot, there were none of the Hochelagans remaining. This remnant of the Toltecans had been swept out of existence between the Algonquin wave from the east and the Iroquois from the southwest. The French heard of a similar race called the Eries and of another the Neutrals, who had the same habits and customs as the vanished Hochelagans, but who had been visited by the scourge of the Iroquois on the Ohio as they ascended it, and had perished. Thus from the twelfth century, the time set for the irruption of the savage tribes from New Mexico, two or three centuries would probably suffice to sweep away the last even of the farthest north Takawgamis. This, say the fifteenth century, would agree very well, not only with time estimated by the early French explorers, but also with the tradition of the Crees who claim that for three or four centuries they have lived sole possessors upon the borders of Lake Superior, Lake of the Woods, and Lake Winnipeg. Our theory then is that the mound builders occupied the region of Rainy and Red Rivers from the eleventh to the fifteenth centuries. Their works remain. HOW OLD