I do not mean to say that they are wrong. But I hold that we know by far too little of this entire period to re-construct that early west-European society with any degree (however humble) of accuracy. And I would rather not state certain things than run the risk of stating certain things that were not so. Then there were other critics, who accused me of direct unfairness. Why did I leave out such countries as Ireland and Bulgaria and Siam while I dragged in such other countries as Holland and Iceland and Switzerland? My answer was that I did not drag in any countries. They pushed themselves in by main force of circumstances, and I simply could not keep them out. And in order that my point may be understood, let me state the basis upon which active membership to this book of history was considered. There was but one rule. "Did the country or the person in question produce a new idea or perform an original act without which the history of the entire human race would have been different?" It was not a question of personal taste. It was a matter of cool, almost mathematical judgment. No race ever played a more picturesque role in history than the Mongolians, and no race, from the point of view of achievement or intelligent progress, was of less value to the rest of mankind. The career of Tiglath-Pileser, the Assyrian, is full of dramatic episodes. But as far as we are concerned, he might just as well never have existed at all. In the same way, the history of the Dutch Republic is not interesting because once upon a time the sailors of de Ruyter went fishing in the river Thames, but rather because of the fact that this small mud-bank along the shores of the North Sea offered a hospitable asylum to all sorts of strange people who had all sorts of queer ideas upon all sorts of very unpopular subjects. It is quite true that Athens or Florence, during the hey-day of their glory, had only one tenth of the population of Kansas City. But our present civilisation would be very different had neither of these two little cities of the Mediterranean basin existed. And the same (with due apologies to the good people of Wyandotte County) can hardly be said of this busy metropolis on the Missouri River. And since I am being very personal, allow me to state one other fact.