Page:A hundred years hence - the expectations of an optimist (IA hundredyearshenc00russrich).pdf/303

 grant any validity at all to the arguments by which I have sought to show that, as time goes on, there will be a decreasing tendency to attempt desired reforms by legislative process, and an increasing tendency to make the public the guardian of its own security, it will be evident that any differences which exist between the nature of scientific progress and the nature of social progress are likely to be accentuated rather than diminished in the course of this century. A change brought about by the spontaneous activity of the people naturally occurs without the definite line of demarcation created by an Act of Parliament.

But there is one way in which the analogy between scientific and social progress will be noteworthy. It is a commonplace of industrial history that an improvement in one machine, or the introduction of some novel method of applying power, always produces, and may very often necessitate, modifications in a number of procedures not previously seen to be connected with it: and great results from little causes flow. No one foresaw, when Mr Edison discovered the differences in the electrical conductivity of carbon induced by slight variations of pressure—a discovery at first utilised only in the micro-tasimeter, the appliance used for measuring small changes in the size of objects submitted to it—that the same discovery would presently render commercially practicable the