In view of even this much of our human efficiency, the exertion requisite for a human creature to do his share of our human work is so slight in proportion to our wealth of power that it is exquisitely absurd for us to speak of it as an expense of energy. Where an individual animal has to pour out his full stock of strength in hunting his prey, or, if graminivorous, in wandering over great areas after grass; man, collective, can produce and distribute food for a thousand by the specialised services of ten men with machinery. The executive efficiency of humanity is raised to such an enormous height that the spectacle of human beings still spending their personal energy at long hours of exhausting labour is an incredible paradox. As far as power goes, one human being should be easily able to “pay for his keep” for life in a year’s work or less. But we are by no means done with the increase of efficiency. This five-times multiplied enginery of ours would still be comparatively futile, if the governing agent, man, had only the stimuli of the beast. The separate animal has his own supply of cerebral energy. It is something. It enables him to co-ordinate his forces, such as they are, and to undertake extreme exertion when he has to, such as it is. He maintains this energy by breathing, eating, and sleeping. Men can do these things too. Men, as separate animals, have each his own supply of cerebral energy. But Man has more. Social energy is quite a different thing from individual energy. By as much as the dynamic force of an elephant is greater than that of the elephant’s bulk in monads, so is the dynamic force of a society greater than that of the mere sum of its individual constituents,—and more. Social energy has been accumulating in humanity from its birth. It is not only that co-ordinate action allows the transmission of wider waves of force than individual action, but that society in its organic function continually stores force in material products, and so establishes an ever enlarging magazine of power. This is where the social body so aids and furthers the action of the social soul. Each material object, so that it be a normal product, embodies and continually transmits the force that made it. We are supplied, by virtue of our social relation, with a large complex brain area; the organ of social life. That great life we partake of in using the social body, in the immediately effective tools, utensils, and machines, and necessary material conveniences of life; but even more as we have access to the great social battery, the work of art. A human brain has not only the existent sum of social energy to draw on, but the stored energy of all the past.