that most of the fruitful practical devices of mankind had their origin in prehistoric times, many of them existing then with little essential difference. Any one of them affords a lesson in the gradual elaboration of the simple. A step minute in itself leads on and on, and so all the practical arts are built up, a readier and more observant mind imitating and adapting the work of predecessors, as we imagined the first man making his first flint axe. The history of the plough goes back to the elongation of a bent stick. The wheel would arise from cutting out the middle of a trunk used as a roller. House architecture is the imitation with logs and mud of the natural shelters of the rocks, and begins its great development when men have learnt to make square corners instead of a rough circle. And so on with all the arts of life or pleasure, including clothing, cooking, tilling, sailing, and fighting. How did this gradual progress come about? Mr. Marvin himself supplies the answer. Through the action of the 'readier and more observant minds'--in other words, through specialization and the division of labour. As far back as we can go in history we find a recognition that men are not all alike, that some have one gift and some another, and that it is to the advantage of society to let each use his own gift in the public service. Among primitive peoples there has indeed often been a belief that men are compensated for physical weakness and disability by peculiar excellence in some sphere of their own. Hephaestos among the Greek gods was lame: so he becomes a blacksmith and uses his arms. Homer is blind: so instead of fighting he sings of war. They would not go so far as to maintain that all lame men must be good blacksmiths or all blind men good poets: but at least they recognized that there was room in the community for special types and that the blacksmith and the poet were as useful as the ordinary run of cultivators and fighting men. The Greek word for craftsman--[Greek: demiourgos]--'worker for the people,' shows how the Greeks felt on this point. To them poetry and craftsmanship were as much honourable occupations or, as we should say, professional activities as fighting and tilling. Whether Homer took to poetry because he could not fight or because he had an overwhelming poetic gift, he had justified his place in the community.