As I glanced at him again, I noticed a surprising change in his appearance. His skin was no longer grey but vivid yellow, and then I noted that he was standing directly in front of a yellow panel. This was interesting in the extreme.

I moved toward him, and again he changed his position. This time he placed himself in front of a blue panel, and I saw the yellow tint of his skin fade away and turn to blue.

On Barsoom there is a little reptile called a darseen which changes its colors to harmonize with its background, just as do our earthly chameleons; but I had never seen any creature even remotely resembling a human being endowed with this faculty of protective coloration. Here, indeed, was the most amazing of all the amazing creatures that I have ever seen.

I wondered if it were endowed with speech, and so I addressed it. "Kaor!" I said; "let's be friends," and I raised my sword hand above my head with the palm toward him, indicating my friendly intentions.

He looked at me for a moment; and then from his upper mouth issued strange sounds, like the purring and meowing of a cat.

He was trying to speak to me, but I could not understand him any more than he could understand me.

How was I to learn his intentions toward me before night fell?

It seemed hopeless, and I resigned myself to wait with composure whatever might occur. I therefore decided to ignore the presence of the creature until it made advances, either hostile or otherwise; and so I walked over and seated myself on the bench that it had quitted.

Immediately it took up a new position as far from me as possible and this time in front of a green panel, whereupon its color immediately changed to green. I could not but wonder what kaleidoscopic result would be obtained were I to chase the thing around this multi-colored apartment. The thought caused me to smile, and as I did so I saw an immediate reaction in my cell-mate. He made a strange purring sound and stretched his upper mouth laterally in what might have been an attempt at an answering smile. At the same time he rubbed his palms up and down his thighs.

It occurred to me that the stretching of the mouth and the rubbing of the thighs might constitute the outward expression of an inner emotion and be intended to denote its attitude toward me; but whether that attitude were friendly or hostile, I could not know. Perhaps my smile had conveyed to the creature a meaning wholly at variance with what a smile is usually intended to convey among the human inhabitants of Earth or Mars.

I recalled that I had discovered this to be a fact among the green men of Barsoom, who laugh the loudest when they are inflicting the most diabolical tortures upon their victims; although that is scarcely analogous to what I mean, as in the case of the green Martians, it is the result of a highly specialized perversion of the sense of humor.