The industrial revolution introduced a new era which began to show its features clearly in the early nineteenth century. On the one hand, a new motive had arisen to favor a more rapid increase of population. Small children could tend machinery and thereby earn wages to increase the family takings. This led to an immediate result in increased population and increased prosperity. But on the other hand, the rapid increase of population always tended to outrun the rapid increase of prosperity, and the more so since the rise of sanitary science began to drive back the invasions of the grosser and more destructive infectious diseases which had hitherto kept the population down. The result was that new forms of disease, distress, and destitution arose; the old stability was lost, and the new prosperity produced unrest in place of well-being. The social consciousness was still too immature to deal collectively with the difficulties and frictions which the industrial era introduced, and the individualism which under former conditions had operated wholesomely now acted perniciously to crush the souls and bodies of the workers, whether men, women or children. As we know, the increase of knowledge and the growth of the social consciousness have slowly acted wholesomely during the past century to remedy the first evil results of the industrial revolution. The artificial and abnormal increase of the population has been checked because it is no longer permissible in most countries to stunt the minds and bodies of small children by placing them in factories. An elaborate system of factory legislation was devised, and is still ever drawing fresh groups of workers within its protective meshes. Sanitary science began to develop and to exert an enormous influence on the health of nations. At the same time the supreme importance of popular education was realised. The total result was that the nature of “prosperity” began to be transformed, instead of being, as it had been at the beginning of the industrial era, a direct appeal to the gratification of gross appetites and reckless lusts, it became an indirect stimulus to higher gratifications and more remote aspirations. Foresight became a dominating motive even in the general population, and a man’s anxiety for the welfare of his family was no longer forgotten in the pleasure of the moment. The social state again became more stable, and more “prosperity” was transformed into civilisation. This is the state of things now in progress in all industrial countries, though it has reached varying levels of development among different peoples.