Consequently free contract and not socialism will be the basis of the political system of a hundred years hence, and the standard of comfort will be adjusted in the same way as everything else. But in order that this standard may be as high as the advanced humanity of the new age will certainly demand for a population vastly increased, it will be necessary that all the resources of the planet be made the most of. That motive power, one of the most important, if not the most important of all these resources, should be economically produced is, as has already been said, an absolute essential. When we make the most of the sources of power, and are able to apply power in convenient and portable ways to all sorts of work at present done by hand, one of the greatest economies conceivable will have been effected. Probably muscle, as an element of workmanship, will become quite obsolete, though muscular strength will be developed by athletics as a recreation and a safeguard to the health of the race. Here again self-respect will be sedulously nurtured, for nothing fosters it so much as a man's sense of his inherent bodily power. All sorts of wastefully laborious methods of labour will be superseded, in the same way as the steam hammer has superseded the sledge hammer. With the perfect development of power-production achieved, a great deal of the dirtiness of manufacture will vanish: and moreover, a use will have been discovered for every by-product of every manufacture. We are hideously wasteful as yet: and wastefulness makes for dirt. One perceives this at once on comparing a factory where the by-products are of a nature to be utilised directly, with one where these products are of small value. A goldsmith's shop is a clean place compared with the gasworks of even a modern town: but these again are clean compared with what they used to be before the various chemical uses of coal-tar and gas-liquor were discovered.