That this strange cortège was a caravan Croft was now assured. He decided to follow it to the city and inspect that as well. Wherefore he kept on beside it down the valley, along what he now saw was a well-defined and carefully constructed road, built of stone, cut to a nice approximation, along which the unwieldy procession made good time. The road showed no small knowledge of engineering. It was like the roads of Ancient Rome, Croft thought with quickened interest. It was in a perfect state of preservation and showed signs of recent mending here and there. While he was feeling a quickened interest in this the caravan entered the cultivated region along the river, and Croft gave his attention to the fields. * * * * * The first thing he noted here was the fact that all growth was due to irrigation, carried out by means of ditches and laterals very much as on earth at the present time. Here and there as the caravan passed down the splendid road he found a farmer's hut set in a bower of trees. For the most part they were built of a tan-colored brick, and roofed with a thatching of rushes from the river's bank. He saw the natives working in the fields, strong-bodied men, clad in what seemed a single short-skirted tunic reaching to the knees, with the arms and lower limbs left bare. One or two stopped work and stood to watch the caravan pass, and Croft noticed that their faces were intelligent, well featured, and their hair for the most part a sort of rich, almost chestnut brown, worn rather long and wholly uncovered or else caught about the brows by a cincture which held a bit of woven fabric draped over the head and down the neck. Travel began to thicken along the road. The natives seemed heading to the city, to sell the produce of their fields. Croft found himself drawing aside in the press as the caravan overtook the others and crowded past. So real had it become to him that for the time he forgot he was no more than an impalpable, invisible thing these people could not contact or see. Then he remembered and gave his attention to what he might behold once more. They had just passed a heavy cart drawn by two odd creatures, resembling a deer save that they were larger and possessed of hoofs like those of earth-born horses, and instead of antlers sported two little horns not over six inches long. They were in color almost a creamy white, and he fancied them among the most beautiful forms of animal life he had ever beheld. On the cart itself were high piled crates of some unknown fowl, as he supposed--some edible bird, with the head of a goose, the plumage of a pheasant so far as its brilliant coloring went, long necks and bluish, webbed feet. Past the cart they came upon a band of native women carrying baskets and other burdens, strapped to their shoulders. Croft gave them particular attention, since as yet he had seen only men.