But there are two other reasons for beginning with the two fixed points of Egypt and Babylon. For one thing they are fixed in tradition as the types of antiquity; and history without tradition is dead. Babylon is still the burden of a nursery rhyme, and Egypt (with its enormous population of princesses awaiting reincarnation) is still the topic of an unnecessary number of novels. But a tradition is generally a truth; so long as the tradition is sufficiently popular; even if it is almost vulgar. And there is a significance in this Babylonian and Egyptian element in nursery rhymes and novels; even the newspapers, normally so much behind the times, have already got as far as the reign of Tutankhamen. The first reason is full of the common sense of popular legend; it is the simple fact that we do know more of these traditional things than of other contemporary things; and that we always did. All travellers from Herodotus to Lord Carnarvon follow this route. Scientific speculations of to-day do indeed spread out a map of the whole primitive world, with streams of racial emigration or admixture marked in dotted lines everywhere; over spaces which the unscientific medieval map-maker would have been content to call ‘terra incognita,’ if he did not fill the inviting blank with a picture of a dragon, to indicate the probable reception given to pilgrims. But these speculations are only speculations at the best; and at the worst the dotted lines can be far more fabulous than the dragon.