CHAPTER I. As far back as our information extends, we find the table-land of Iran occupied by a group of nations closely related to each other, and speaking dialects of the same language. On the edges of that great desert, which occupies the centre of the land, are tracts of pasture, and further inland, treeless steppes, which, however, are watered here and there by brackish pools, and produce a salt vegetation barely sufficient to provide buffaloes and camels with sustenance, until the soil becomes entirely barren. In the western part of these steppes wandered a pastoral people, whom...