The industrial organization of society has undergone a development with the development of capital. Nothing has ever made men spread over the earth and develop the arts but necessity--that is, the need of getting a living, and the hardships endured in trying to meet that need. The human race has had to pay with its blood at every step. It has had to buy its experience. The thing which has kept up the necessity of more migration or more power over Nature has been increase of population. Where population has become chronically excessive, and where the population has succumbed and sunk, instead of developing energy enough for a new advance, there races have degenerated and settled into permanent barbarism. They have lost the power to rise again, and have made no inventions. Where life has been so easy and ample that it cost no effort, few improvements have been made. It is in the middle range, with enough social pressure to make energy needful, and not enough social pressure to produce despair, that the most progress has been made. At first all labor was forced. Men forced it on women, who were drudges and slaves. Men reserved for themselves only the work of hunting or war. Strange and often horrible shadows of all the old primitive barbarism are now to be found in the slums of great cities, and in the lowest groups of men, in the midst of civilized nations. Men impose labor on women in some such groups today. Through various grades of slavery, serfdom, villeinage, and through various organizations of castes and guilds, the industrial organization has been modified and developed up to the modern system. Some men have been found to denounce and deride the modern system--what they call the capitalist system. The modern system is based on liberty, on contract, and on private property. It has been reached through a gradual emancipation of the mass of mankind from old bonds both to Nature and to their fellow-men. Village communities, which excite the romantic admiration of some writers, were fit only for a most elementary and unorganized society. They were fit neither to cope with the natural difficulties of winning much food from little land, nor to cope with the malice of men. Hence they perished. In the modern society the organization of labor is high. Some are land-owners and agriculturists, some are transporters, bankers, merchants, teachers; some advance the product by manufacture. It is a system of division of functions, which is being refined all the time by subdivision of trade and occupation, and by the differentiation of new trades.