The personal, rather than the communal, advance is the main consideration, inasmuch as it is personal initiative of the most able which helps the rest of the community forward. The greatest improvements are the result of a single mind, animating perhaps a small group of similar minds. We all know how such great benefits as prison reform, the abolition of slavery, the restriction of child labour, and similar movements of which the public are now proud, were each originated by one mind, and worked by a small group in the teeth of the bitterest opposition to start with. It goes without saying that the same is the case in all inventions; it takes not only an inventor, but also a commercial organiser (seldom one and the same man), to help the public to any improvement. If ten thousand men could be picked out of any one country, so as to remove the most fruitful minds, that country would come to an entire standstill, and would continue in mechanical repetition until a fresh generation gave a chance of the rise of original minds. Probably not more than one in a thousand minds causes useful advance among the others. And the majority of men lead automatic lives, of which the reflexes have been trained by teaching and experience to do what is required, and the daily actions are performed without a single real thought, but only in response to external stimuli of sights and orders. It is therefore in the development of the able individuals, and in giving every chance to such whenever they arise, that the hopes of the great mass must lie. It is perhaps not too much to say that all general popular advance of the community at large is based on the prevention of waste. Wherever waste exists improvement is possible; and we need not trouble ourselves much about the construction of the social organism, so long as we can lay our finger on the waste and check it. As with a machine we know the amount of force that is put into it, and can see what percentage is yielded up usefully in its output, so it is with a community. The design of the nature and quality of work done by the community or the machine is another matter; though that again comes under the head of waste if the quality is bad. We will now look more precisely at the gains by prevention of waste in health, life, energy, and renewal.