Dlonysius of Halicarnassus tells us that History is “Philosophy teaching by examples.” Of all the definitions of history, this, one of the oldest, is probably one of the best. It is assuredly the best in a scientific point of view, since it places history in the true light of a natural science. It is as though it said history is the record of phenomena which occur and which recur, so that an example is set which may be accepted and remembered as something that will be seen again and recognised again like other and more obviously mechanical examples of natural processes.