the manner in which they worked I suspected that they had no opposable thumbs—that the whole hand had to be used like the paw of a squirrel to grasp an object. I pointed to these, directing my companion's attention and asking, "What are they?" "Ambau," he said, but apparently without the slightest interest in their proceedings. Indeed, the regularity and entire freedom from alarm or vigilance which characterised their movements, convinced me that both these and the birds we passed were domesticated creatures, whose natural instincts had been turned to such account by human training.
After a few moments more, we came in sight of a regular road, in a direction nearly at right angles to that which followed the course of the river. Like the path, it was constructed of a hard polished concrete. It was about forty paces broad, and in the centre was a raised way about four inches higher than the general surface, and occupying about one-fourth of the entire width. Along the main way on either side passed from time to time with great rapidity light vehicles of shining metal, each having three wheels, one small one in front and two much larger behind, with box-like seat and steering handle; otherwise resembling nothing so much as the velocipedes I have seen ridden for amusement by eccentric English youths. It was clear, however, that these vehicles were not moved by any effort on the part of their drivers, and their speed was far greater than that of the swiftest mail-coach:—say, from fifteen to thirty miles an hour. All risk of collision was avoided, as those proceeding in opposite directions took opposite sides of the road, separated
