It was probably about the same era that some pre-Hellenic race, led (so it is written) by the mythical hero Dionysos, trod the weary route from the Euxine to the Caspian, and from the southern shores of the Caspian to the borderland of modern Indian frontier, where their descendants welcomed Alexander on his arrival as men of his own faith and kin, and were recognised as such by the great conqueror. Now all this points to an acquaintance with the geographical links between East and West which appears nowhere in any written record. Nowhere can we find any clear statement of the actual routes by which these pilgrims were supposed to have made their long and toilsome journeys. Just the bare facts are recorded, and we are left to guess the means by which they were accomplished. But it is clear that the old-world overland connection between India and the Black Sea is a very old connection indeed, and further, it is clear that what the Greeks may not have known the Persians certainly did know. When Herodotus first set solidly to work on a geographical treatise which was to embrace the existing knowledge of the whole world, he undoubtedly derived a great deal of that knowledge from official Persian sources; and it may be added that the early Persian department for geographical intelligence has been proved by this last century's scientific investigations to have collected information of which the accuracy is certainly astonishing. It is only quite recently, during the process of surveys carried on by the Government of India through the highlands and coast regions of Baluchistan and Eastern Persia, that anything like a modern gazetteer of the tribes occupying those districts has been rendered possible. Twenty-five years ago our military information concerning ethnographic distributions in districts lying immediately beyond the north-western frontier was no better than that which is contained in the lists of the Persian satrapies, given to the world by Herodotus nearly 500 years before the Christian era. Twenty-five years ago we did not know of the existence of some of the tribes and peoples mentioned by him, and we were unable to identify others. Now, however, we are at last aware that through twenty-four centuries most of them have clung to their old habitat in a part of the Eastern world where material wealth and climatic attractions have never been sufficient to lead to annihilation by conquest. Oppressed and harried by successive Persian dynasties, overrun by the floatsam and jetsam of hosts of migratory Asiatic peoples from the North, those tribes have mostly survived to bear a much more valuable testimony to the knowledge of the East entertained by the West in the days of Herodotus than any which can be gathered from written documents.