Affairs at the settlement near the fire-cave now moved along smoothly. Their new weapons enabled the hunters to secure abundance of food in a country teeming with animal life, now that they dared attack the larger animals. Cooking made both the flesh and vegetables more nourishing as well as more appetizing, and soon the enormous stomachs, no longer continually distended with raw and indigestible food, became reduced in size and their bodies less unwieldy. Made confident by the use of fire and superior weapons, the men now walked fully erect and wandered through the forest with little fear. As their supply of nourishing food increased, more children were born than before, and the mortality among infants was greatly reduced. All this tended toward a rapid increase of population in the settlement. This increase in the population necessitated more habitations, and this, at the time meant more caves, for this was the epoch of cave-men. After all the available caves in the ravine and vicinity had been appropriated, an enterprising young man of the group who, by reason of mutual attachment and because of the example, perhaps, of Longhead and Broken Tooth, had induced a young woman to establish similar relations with him, being unable to find an unoccupied cave, concluded to establish housekeeping upon a horizontal ledge overhung by a projecting rocky cliff. This location, protected only in the rear, soon proved to be too exposed for comfort, and the couple concluded to improve it. They took several good sized sticks of different lengths which had been burned off by the fires and after leaning them up against the sloping rock, piled on brush and grass. This was much better than the open front, but a coal from their fire having blown into the grass after it had dried, caused a conflagration which reduced them to their former condition. The man proved to be quite intelligent, and he began to select logs of the same length, burning them off at the proper place when necessary; and these they sloped up side by side at the front as before, but, mindful of the fire, they filled the interstices with sticks, stones and moss, finally plastering the whole front, except for a small opening for entrance, with mud. This was a great improvement over all former conditions; the rain and wind were excluded, to a considerable extent; indeed, it was preferable to a cave. It was lighter and better ventilated, and, when they had learned to construct movable frames which could be securely fastened in the doorways, to prevent incursions by wild animals, these lean-tos or rock-shelters, the remains of which have been found in many parts of Europe, became the favorite habitations of the people of the group.