It is, I think, one of the outstanding characteristics of our age that during a short spell of thirty or forty years fundamental advances have been made in a large number of different sciences. These developments have altered almost every aspect of material life—they have certainly had great influence upon modern education, and upon modern ideas of politics, as well as upon a host of less important things. But chief of all we notice the effect of this Golden Age of Science in the birth of new ideas. The revolution in ideas has only just started. Where it will end no one can see.