6. The evolution of mind in the animal world in general is suggested by the fact that mind in man has evolved. The rich, luminous intellect of civilised man, with its art, science, law, literature, government, and morality, has been evolved from the rude, raw, demon-haunted mind of the savage. Evidence of this evolution is furnished by the recorded facts of human history, by the antiquarian collections of our museums, and by a study of existing savages. In all our museums there are collections of the relics of prehistoric peoples. These collections consist of objects upon which men in distant ages of the world have wrought—their weapons, ornaments, utensils, implements, and playthings—which have been saved from the teeth of Time by their durability. The character of the minds which operated on these objects, which produced and used them, may be inferred from the character of the objects, just as the life and surroundings of an ancient animal or plant may be inferred from its fossil. These relics are of stone, bone, bronze, and iron. They are found in almost every region of the earth—all over Europe and its islands, in western and central Asia, in China and Japan, in Malay, Australia, and New Zealand, in the islands of the Pacific, and throughout the length and breadth of America. They antedate human history by thousands of years. They are the ruins of the Stone Age, the Bronze Age, and the Iron Age of mankind. In all of these remains there is evidence of a slow but gradual improvement as we approach the present. There are places on the earth where the evolution of human implements, from the rudest chipped stones to the comparatively finished products of historic peoples, is epitomised in the deposits of a few feet in depth. One of these occurs at Chelles, a suburb of Paris, and was made the subject of a paper by Professor Packard in the _Popular Science Monthly_ for May, 1902. Here three distinct layers, containing human remains entirely different in character from each other, appear within a depth of 30 feet from the surface. The lowest bed, a layer of pebbles and sand, and probably preglacial in origin, contains the famous Chellean ‘axes,’ rude almond-shaped implements of chipped flint, and used by these ancient inhabitants by being held in the hand. In this bed are also found the bones of the straight-tusked elephant, cave-bear, big-nosed rhinoceros, and other species now extinct. The next bed is the interglacial, and contains implements entirely different from the one below it, among which are skin-scrapers and lance-points. The animal remains of this bed are also different from those found in the bed below, and include animals like the musk-ox and the reindeer, which were probably driven to this southern clime from more northern regions by the excessive cold of the time. The third bed, which lies just below the surface soils, contains polished stone axes and other remains of human industry cotemporaneous with the Swiss lake-dwellers.