wondered at this strange planet where the only large animals were men, dogs, grass cats, a small deer and a very small equine. In fact, there was a paucity of any variety of animal life, except for the surprisingly large number of birds. It was this scarcity of horses and oxen, he supposed, that helped perpetuate slavery. Man and dog had to provide most of the labor.

No doubt there was an explanation for all this, but it must be buried so deep in this people's forgotten history that one would never know. Green, always curious, wished that he had time and means to explore. But he didn't. He might as well resign himself to keeping a whole skin and to getting out of this mess as fast as he could.

There was enough to do merely to make his way through the narrow and crowded streets. He had to display his baton often to clear a path, though when he approached the harbor area he had less trouble because the streets were much wider.

Here great wagons drawn by gangs of slaves carried huge loads to or from the ships. The thoroughfares had to be broad, else the people would have been crushed between wagon and house. Here also were the so-called Pens, where the dock-slaves lived. Once the area had actually been an enclosure where men and women were locked up for the night. But the walls had been torn down and new houses built in the old Duke's time. The closest Earthly parallel Green could think of for these edifices was a housing project. Small cottages, all exactly alike, set in military columns.

For a moment he considered stopping off to see Amra, then decided against it. She'd get him tied up in an argument or something, and he'd spend too much time trying to soothe her, time that should be spent at the marketplace. He hated scenes, whereas Amra was a born self-dramatist who reveled in them, almost wallowed, one might say.

He averted his eyes from the Pens and looked at the other side of the street, where the walls of the great warehouses towered. Workmen swarmed around them, and cranes, operated by gangs pushing wheels like a ship's capstan, raised or lowered big bundles. Here, he thought, was a business opportunity for him.Introduce the steam engine. It'd be the greatest thing that ever hit this planet. Wood-burning automobiles could replace the rickshaws. Cranes could be run by donkey-engines. The ships themselves could have their wheels powered by steam. Or perhaps, he thought, rails could be laid across the Xurdimur, and locomotives would make the ships obsolete. No, that wouldn't work. Iron rails cost too much. And the 

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