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 The majority of these cities moved in harmony in a world-wide course, requiring about one year or four hundred of our days to complete a single circuit. As was their prototype, so they were propelled by a series of motors and a splendid sail system. At times the wind did the greater part of the work, and again the full force of the motors was required.

Let me ask you to get on board one of these cities, and take one year's journey in a few minutes.

For instance, take one of the vehicle cities, composed of one hundred factory buildings and three thousand dwellings, all built of non-combustible materials.

The city is now in the harbor of a great port, and all the merchantmen who live nearest to this port have been informed that the vehicle city would arrive about midweek and remain four days. What a busy time follows after the floating city is fastened to its moorings! Inhabitants go on solid ground to do their trading. Dealers make large purchases and place extensive orders.

It should be stated that the mail and