and south traffic intersections. All vehicular traffic moves in but one direction on any avenue, the direction of flow alternating, so that half the avenues carry traffic in one direction and the other half in the opposite direction. Left turns are made without diminishing speed by the simple expedient of rising above both lanes of traffic. The result is that traffic flows steadily in all directions at an average speed of about fifty miles an hour. Parking accommodations are frequent, and are found inside buildings at a level of about sixty feet above the pavement. North and south pedestrian traffic moves without interruption in either direction on both sides of North and South Streets at the ground level; and, similarly, on East and West Streets through underpasses at street intersections.

I have gone into this matter of traffic control in a Martian city in some detail, and perhaps tediously, because of what John Carter has told me of the congestion and confusion in traffic handling in earthly cities, and in the hope that the inventors of our sister planet will be encouraged to develop ground fliers similar to those commonly used in the cities of Mars.

The palace grounds, which were our destination, covered an area of about eighty acres. The avenues leading to it were lined with the palaces of the nobility, just beyond which were the better-grade shops and hotels. Amhor is a small city and the only one in the principality which might claim the dignity of such a title, the others being but small and widely scattered villages. The chief business of the principality is

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