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With the Yellow Men men. This good friend even accompanied us part way, and then, promising to aid us in any way that he found possible, bade us adieu.

On parting he slipped upon my finger a curiously wrought ring set with a dead-black, lusterless stone, which appeared more like a bit of bituminous coal than the priceless Barsoomian gem which in reality it is.

"There have been but three others cut from the mother stone," he said, "which is in my possession. These three are worn by nobles high in my confidence, all of whom have been sent on secret missions to the court of Salensus Oll.

"Should you come within fifty feet of any of these three you will feel a rapid, pricking sensation in the finger upon which you wear this ring. He who wears one of its mates will experience the same feeling; it is caused by an electrical action that takes place the moment two of these gems cut from the same mother stone come within the radius of each other's power. By it you will know that a friend is at hand upon whom you may depend for assistance in time of need.

"Should another wearer of one of these gems [ 167 ]