There was hilarity and universal enjoyment, though the assemblage, almost by instinct, divided itself into two groups. The cave men and the Shell men, while at this time friendly, were, as has been indicated, unlike in many tastes and customs and to an extent unlike in appearance. The cave man, accustomed to run like the deer along the forest ways, or to avoid sudden danger by swift upward clambering and swinging along among treetops, was leaner and more muscular than the Shell man, and had in his countenance a more daring and confident expression. The Shell man was shorter and, though brawny of build, less active of movement. He had spent more hours of each day of his life in his rude raft-boat, or in walking slowly with poised spear along creek banks, or, with bent back, digging for the great luscious shell-fish which made a portion of his food, than he had spent afoot and on land, with the smell of growing things in his nostrils. The flavor of the water was his, the flavor of the wood the cave man's. So it was that at the feast of the mammoth the allies naturally and good-naturedly became somewhat grouped, each person according to his kind. When hunger was satisfied and the talking-time came on, those with objects and impulses the same could compare notes most interestedly. Constantly the number of the feasters increased, and by mid-day there was a company of magnitude. Much meat was required to feed such a number, but there were tons of meat in a mammoth, enough to defy the immediate assaults of a much greater assemblage than this of exceedingly healthy people. And the smoke from the fires ascended and these rugged ones ate and were happy. But there came a time in the afternoon when even such feasters as were assembled on this occasion became, in a measure, content, when this one and that one began to look about, and when what might be called the social amenities of the period began. Veterans flocked together, reminiscent of former days when another mammoth had been driven over this same cliff; the young grouped about different firesides, and there was talk of feats of strength and daring and an occasional friendly grapple. Slender, sinewy girls, who had girls' ways then as now, ate together and looked about coquettishly and safely, for none had come without their natural guardians. Rarely in the history of the cave men had there been a gathering more generally and thoroughly festive, one where good eating had made more good fellowship. Possibly--for all things are relative--there has never occurred an affair of more social importance within the centuries since. Human beings, dangerous ones, were merry and trusting together, and the young looked at each other.