"It is indeed a phosphori as, if I recall it aright, the sulphides of barium, strontium, and calcium were upon our earth. Later I shall see the great quarries of this stone in the Martian mountains. Another strange feature in these Martian houses was the hollow sphere of glass upheld above each house. It is a sphere some six feet in diameter made up of lenses. It encloses a space in the center of which is a ball of the phosphorescent stone. During the day the rays of the sun are concentrated upon this ball of stone, and at night the stored-up sunlight is radiated into lambent phosphorescent light. "It was the close of a Martian day that I felt the returning impact of volition and left the chorus hall. I emerged, as I said before, upon the broad platform with its colonnade of columns and arches and saw the city as the night drew on. It is difficult to put in words, my son, the wonderful effect. "Each house built of this strange substance, which throughout the day had been storing up the energies of light, now, as the fading day waned, became a center of light itself. At first a glow covered the sides of the houses, the colonnade and dome, while the glass prisms above them sent out rays from their imprisoned balls of phosphori. The glow spread, rising from the outskirts of the city in the lower grounds to the summits of the hills where the sun's last rays lingered. It became intensified. The green beds of trees were black squares and the houses, pulsating fabrics of light between them. A slight variety of architecture in places was accentuated by diverse and varying lines or surface light. "The whole finally blended and a sea of radiance was before me in which the beautiful houses were descried, the illuminated groves, and like enormous scintillations the glassy spheres--the Martians call them the _Plenitudes_ above them. Many other developing beings were around me, and voiceless, mute, impassioned, with an admiration which we had as yet no adequate organs to express we gazed upon the throbbing metropolis, ourselves luminous spectres in the vast eruption of glorious light before, above, around us. "As the night settled down the light grew more intense, more beautiful. I could discern the opalescent glasses in the houses sending out their parti-colored rays, patching the trees with quilts of changing colors, and far away there came, still unsubdued by the night, the continuous elation of music.