His lack of natural weapons he overcame by borrowing the idea of the tooth and claw of the other animals, imitating them in flint and shaping them into spears; borrowing the trunk of the elephant and the paw of the tiger, and reproducing their blow-striking qualities in his wooden club. Not only this but he took lessons from the supple limbs and branches of the trees, and copied the principle in his bow, in order to project its minature spear, his arrow. He sheltered himself, his mate and his young, from the fury of the storm, first by caves and afterwards by rude houses, built in inaccessible places, reached only by means of crude ladders, bridges, or climbing poles. He built doors for his habitations, to protect himself from the attacks of these wild enemies--he heaped stones at the mouth of his caves to keep them out. He placed great boulders on cliffs that he might topple them down on the approaching foe. He learned to hurl rocks with sure aim with his strong arm. He copied the floating log, and built his first rude rafts, and then evolved the hollowed canoe. He used the skins of animals to keep him warm--their tendons for his bowstrings. He learned the advantages of cooperation and combined effort, and thus formed the first rudiments of society and social life. And finally--man's first great discovery--he found the art of fire making. As a writer has said: "For some hundreds of years, upon the general plane of self-consciousness, an ascent, to the human eye gradual but from the point of view of cosmic evolution rapid, has been made. In a race large-brained, walking-erect, gregarious, brutal, but king of all other brutes, man in appearance but not in fact, was from the highest simple-consciousness born the basic human faculty, self-consciousness and its twin, language. From these and what went with these, through suffering, toil and war; through bestiality, savagery, barbarism; through slavery, greed, effort, through conquests infinite, through defeats overwhelming, through struggle unending; through ages of aimless semi-brutal existence, through subsistence on berries and roots; through the use of the casually found stone or stick; through life in deep forests, with nuts and seeds, and on the shores of waters with mollusks, crustaceans and fish for food; through that greatest, perhaps, of human victories, the domestication and subjugation of fire; through the invention and art of bow and arrow; through the training of animals and the breaking of them to labor; through the long learning which led to the cultivation of the soil; through the adobe brick and the building of houses therefrom; through the smelting of metals and the slow birth of the arts which rest upon these; through the slow making of alphabets and the evolution of the written work; in short, through thousands of centuries of human life, of human aspiration, of human growth, sprang the world of men and women as it stands before us and within us today