livid. He leaped toward them. “Creatures!” he screamed. “Down! Down upon your bellies before the last of the jeddaks of Barsoom!” [1] On Barsoom the ad is the basis of linear measurement. It is the equivalent of an Earthly foot, measuring about 11.694 Earth inches. As has been my custom in the past, I have generally translated Barsoomian symbols of time, distance, etc., into their Earthly equivalent, as being more easily understood by Earth readers. For those of a more studious turn of mind it may be interesting to know the Martian table of linear measurement, and so I give it here: 10 sofads = 1 ad 200 ads = 1 haad 100 haads = 1 karad 360 karads = 1 circumference of Mars at equator. A haad, or Barsoomian mile, contains about 2,339 Earth feet. A karad is one degree. A sofad about 1.17 Earth inches. CHAPTER VII. THE PHANTOM BOWMEN As Jav leaped toward him Carthoris laid his hand upon the hilt of his long-sword. The Lotharian halted. The great apartment was empty save for the four at the dais, yet as Jav stepped back from the menace of the Heliumite’s threatening attitude the latter found himself surrounded by a score of bowmen. From whence had they sprung? Both Carthoris and Thuvia looked their astonishment. Now the former’s sword leaped from its scabbard, and at the same instant the bowmen drew back their slim shafts. Tario had half raised himself upon one elbow. For the first time he saw the full figure of Thuvia, who had been concealed behind the person of Carthoris. “Enough!” cried the jeddak, raising a protesting hand, but at that very instant the sword of the Heliumite cut viciously at its nearest antagonist. As the keen edge reached its goal Carthoris let the point fall to the floor, as with wide eyes he stepped backward in consternation, throwing the back of his left hand across his brow. His steel had cut but empty air—his antagonist had vanished—there were no bowmen in the room! “It is evident that these are strangers,” said Tario to Jav. “Let us first determine that they knowingly affronted us before we take measures for punishment.” Then he turned to Carthoris, but ever