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 describe, is the sole means of distant communication employed in Mars. Those who have not leisure or do not care to visit one of the offices, never more than twelve-miles distant from one another, in which the public instruments are kept, can have a wire conveyed to their own house. Almost every house of any pretension possesses such a wire. Leading me into the next apartment, my friend pointed out an immense number of instruments of a box-like shape, with a slit in which a leaf of about four inches by two was placed. These were constantly ejected and on the instant mechanically replaced. The fallen leaves were collected and sorted by the officers present, and at once placed in one or other of another set of exactly similar instruments. Any one possessing a private wire can write at his own desk in the manual character a letter or message on one of these slips. Placing it in his own instrument, it at once reproduces itself exactly in his autograph, and with every peculiarity, blot, or erasure, at the nearest office. Here the copy is placed in the proper box, and at once reproduced in the office nearest the residence of the person to whom it is addressed, and forwarded in the same manner to him. A letter, therefore, covering one of these slips, and saying as much as we could write in an average hand upon a large sheet of letter-paper, is delivered within five minutes at most from the time of despatch, no matter how great the distance.

I remarked that this method of communication made privacy impossible.

"But," replied the official, "how could we possibly have time to indulge in curiosity? We have to sort hundreds of these papers in an hour. We have just