The first feature which struck Robert was the immense height of the buildings, practically all of which were of ten stories or more. Buildings of thirty stories were common, while several they passed were more than sixty stories. The rather narrow streets seemed like miniature canyons between the tall structures. Without exception the buildings appeared to be constructed of a fine cement, similar to the metallic product of which the railroad rails were made. The street paving and walks were also made of the same material, and were in excellent condition. No poles or wires were visible; nor were any street-cars or tracks seen. Evidently with such excellently maintained pavings made possible by the weak gravity, the Martians preferred ordinary vehicles for city transportation. Stores of all sorts seemed plentiful, though Robert could not see what kind they were, because they did not display their wares as we do. The Martians apparently bad outlived the practise of wasting window space in this manner, preferring merely to advertise their wares by signs. These signs, of course, were wholly unintelligible to Robert and the professor. The lettering was made up of a number of geometrical figures, among which the familiar triangle, square and “T,” with variations, predominated. Once, when their conveyance was temporarily stalled in a traffic congestion, Robert got out a pencil and attempted to reproduce the characters which appeared in relief over the doorway of an imposing-looking building near by: [Illustration: Martian words.] No suggestion of a curve softened any of the characters, each one being made up of a series of straight lines and angles. In fact, Robert already had observed that this severe precision was a marked characteristic of all things Martian. It was particularly noticeable in the architecture. The impression borne upon him was that this people had reduced everything to a science of fine mathematics. * * * * * A ride of some twenty minutes brought them into a quieter section of the city. Here the streets were somewhat wider. The tall buildings gave way to more modest structures, which appeared to be dwellings not unlike our apartment buildings. No sign of any growing thing was visible anywhere--not even a blade of grass. Evidently the painful scarcity of water upon the planet did not permit of floral culture for merely ornamental purposes. Theirs was a serious business of scientific economy. In due time they turned into a broad driveway leading to an immense, official building of four stories. Here Robert saw the first bit of ground uncovered by cement or stone since they had arrived in the city. The grounds surrounding the building, and its drives, were covered with verdure similar to a fine clover, closely cut. Some trees grew about the place, but there were no flowers.