But under the thick hooding was horror. It slithered and it had nothing like a recognizable human shape or walk, and I felt the primeval ape in me cowering and gibbering in a corner of my brain. Kyral muttered, close to my ear, "No outsider is ever allowed to look on the Silent Ones in their real form. I think they're deaf and dumb, but be damn careful."

"You bet," I whispered, and was glad the streets were empty. I walked along, trying not to look at the gliding motion of that shrouded thing up ahead.

The trading was done in an open hut of reeds which looked as if it had been built in a hurry, and was not square, round, hexagonal or any other recognizable geometrical shape. It formed a pattern of its own, presumably, but my human eyes couldn't see it. Kyral said in a breath of a whisper, "They'll tear it down and burn it after we leave. We're supposed to have contaminated it too greatly for any of the Silent Ones ever to enter again. My family has traded with them for centuries, and we're almost the only ones who have ever entered the city."

Then two of the Silent Ones of Canarsa, also covered with that coarse shiny stuff, slithered into the hut, and Kyral choked off his words as if he had swallowed them.

It was the strangest trading I had ever done. Kyral laid out the small forged-steel tools and the coils of thin fine wire, and I unpacked my lenses and laid them out in neat rows. The Silent Ones neither spoke nor moved, but through a thin place in the gray veiling I saw a speck which might have been a phosphorescent eye, moving back and forth as if scanning the things laid out for their inspection.

Then I smothered a gasp, for suddenly blank spaces appeared in the rows of merchandise. Certain small tools—wirecutters, calipers, surgical scissors—had vanished, and all the coils of wire had disappeared. Blanks equally had appeared in the rows of lenses; all of my tiny, powerful microscope lenses had vanished. I cast a quick glance at Kyral, but he seemed unsurprised. I recalled vague rumors of the Silent Ones, and concluded that, eerie though it seemed, this was merely their way of doing business.

Kyral pointed at one of the tools, at an exceptionally fine pair of binocular lenses, at the last of the coils of wire. The shrouded ones did not move, but the lenses and the wire vanished. The small tool remained, and after a moment Kyral dropped his hand.

I took my cue from Kyral and remained motionless, awaiting whatever surprise was coming. I had halfway expected what happened next. In the blank spaces, little points of light began to glimmer, and after a moment, blue and red and green gem-stones appeared there. To me the substitution appeared roughly equitable and fair, though I am no judge of the fine points of gems.

Kyral scowled slightly and pointed to one of the green gems, and after a moment it whisked away and a blue one took its place. In another spot where a fine set of surgical instruments had lain, Kyral pointed at the blue gem which now lay there, shook his head and held out three fingers. After a moment, a second blue stone lay winking beside the first.

Kyral did not move, but inexorably held out the three fingers. There was a little swirling in the air, and then both gems vanished, and the case of surgical instruments lay in their place.