I had observed that the air of the hotel was sweeter, purer and cooler than that of the streets outside. I asked one of the attendants for an explanation. He took me out to where we could command a view of the whole building, and showed me that a great canvas pipe rose high above the hotel, and, tracing it upwards, far as the eye could reach, he pointed out a balloon, anchored by cables, so high up as to be dwarfed to a mere speck against the face of the blue sky. He told me that the great pipe was double; that through one division rose the hot, exhausted air of the hotel, and that the powerful draft so created operated machinery which pumped down the pure, sweet air from a higher region, several miles above the earth; and, the current once established, the weight of the colder atmosphere kept up the movement, and the air was then distributed by pipes to every part of the hotel. He told me also that the hospitals of the city were supplied in the same manner; and the result had been, be said, to diminish the mortality of the sick one-half; for the air so brought to them was perfectly free from bacteria and full of all life-giving properties. A company had been organized to supply the houses of the rich with his cold, pure air for so much a thousand feet, as long ago illuminating gas was furnished. I could not help but think that there was need that some man should open connection with the upper regions of God's charity, and bring down the pure beneficent spirit of brotherly love to this afflicted earth, that it might spread through all the tainted hospitals of corruption for the healing of the hearts and souls of the people. This attendant, a sort of upper-servant, I suppose, was quite courteous and polite, and, seeing that I was a stranger, he proceeded to tell me that the whole city was warmed with hot water, drawn from the profound depths of the earth, and distributed as drinking water was distributed a century ago, in pipes, to all the houses, for a fixed and very reasonable charge. This heat-supply is so uniform and so cheap that it has quite driven out all the old forms of fuel--wood, coal, natural gas, etc.