xvi LIST OF ILLUSTRATIONS 



FIGURE PAGE 



215. First stage in the history of the Great Lakes, when all the rest of 



the lake basins were still buried under the ice 343 



216. Lake Whittlesey stage of the Great Lakes history, when the eastern 



and western ice-margin lakes combined with outlet past Chicago. 344 



217. Glacial Lake Warren 345 



218. Glacial Lakes Duluth, Chicago and Lundy 346 



219. The Algonquin-Iroquois stage of the Great Lakes, with outlet 



through the Mohawk-Hudson Valleys of New York 347 



220. The Nipissing Great Lakes and their correlatives 349 



221. Sketch map of central New York, showing the relation of the pre- 



Glacial drainage to that of the present 352 



222. Sketch map of the southeastern Adirondack region, showing the 



relation of the pre-Glacial drainage to that of the present . . . 353 



223. Sketch map of the Niagara River gorge 354 



224. Pre-Glacial drainage of the Upper Ohio River Basin 355 



225. Pre-Glacial drainage (dotted lines) of a part of northwestern 



Illinois 356 



226. Diagram showing effect of Precession 362 



227. Map showing extent of the extinct Lakes Bonneville (a) and 



Lahontan (b) in the western United States 367 



228. Map showing the extent of ice in Europe at the time of maximum 



glaciation 368 



229. A great Ground-sloth, Megatherium americanum 369 



230. Great armored Glyptodonts, Doedicurus clavicaudaliis and Glyp- 



todon clavipes 370 



231. Table to show the principal geologic stages in the history of 



Man 374 



232. Comparison of skull profiles of lowest types of Men and highest 



Apes 375 



233. Restoration of the head of Pithecanthropus erect us 375 



234. Comparison of skulls 376 



235. A charging wild Boar, one of the best paintings by Paleolithic 



Man in the cave at Altimira, Spain 379 



236. The "Procession of Mammoths" ; a painting by Paleolithic Man 



in a cave at Font-de-Gaume in west-central France 380 



237. Line cut copy of a Paleolithic painting in the cave at Cogul, Spain. 380 



238. Map of the United States showing the principal physiographic 



provinces frequently referred to in the text 382 



