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 and twenty miles. If we take his kos as being a mile and a half, we have to place the south gate at the Arab Sarai, near Humayun's tomb, the north being the solitary gateway, which is near the jail. It is hard, however, to understand how he could miscount the number of kos, when each kos was marked by a prominent pillar, most of which are standing to this day ; if the *' kos minars " were really erected by Jahangir (as that king says), at a later date, we can easily account for it, because the natives reckon a kos rather by time taken than by actual distance, and he probably got his information from native retainers. The point is not, perhaps, one of great importance ; it only shows the difficulties of reconciling such information as we possess of those times with the monuments we have remaining to us to-day.

Kalan Masjid. — This mosque stands near the Turkman Gate, within the walls of the modern city, but was also included within the limits of Firozabad ; the word *' kalan" means ''great," but the word has been corrupted, and the building is sometimes called the *' Black " Mosque. The style is the same as that of the Khirki Mosque, built at about the same time, 1380, but; has a single open court; the sloping 122