force that entirely disintegrated all the metal parts of the patrol flier that sought to intercept and question it. Even the weapons and the metal portions of the harness of the crew were dissipated into nothing, a fact that was easily discernible from an examination of the wreck of the patrol flier and the bodies of its crew. Wood, leather, flesh, everything of the animal and vegetable kingdom that was aboard the flier, has been found scattered about the ground where it fell, but no trace of any metallic substance remains.

"I am impressing this upon you because it suggests to my mind a possible clue to the general location of the city of these new enemies of Helium. I am convinced that this is but the first blow, since any navy armed with such guns could easily hold Helium at its mercy, and few indeed are the cities of Barsoom outside the empire that would not seize with avidity upon any instrument that would give them the sack of the Twin Cities.

"For some time now we have been deeply concerned by the increasing number of missing ships of the navy. In nearly all instances these were ships engaged in charting air currents and recording atmospheric pressures in different parts of Barsoom far from the empire, and recently it has become apparent that the vast majority of these ships which never return were those cruising in the southern part of the western hemisphere, an unhospitable portion of our planet concerning which we have unfortunately but little knowledge owing to the fact that we have developed no trade with the unfriendly people inhabiting this vast domain.

"This, Hadron of Hastor, is only a suggestion; only the vaguest of clues, but I offer it to you for what it is worth. A thousand one-man scout fliers will be dispatched between now and noon tomorrow in search of the abductors of Sanoma Tora; nor will these be all. Cruisers and battleships will take the air as well, for Helium must know what city or what nation has developed a weapon of destruction such as that used above Helium this night.

"It is my belief that the weapon is of very recent invention and that whatever power possesses it, must be bending every effort to perfect it and produce it in such quantities as to make them masters of the world. I have spoken. Go, and may fortune be with you."

You may believe that I lost no time in setting out upon my mission now that I had authority from John Carter. Going to my quarters I hastened my preparation for departure, which consisted principally of making a careful selection of weapons and of exchanging a 

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