“Do those differ materially from the R-rays you described when you were telling me about the small arms used by the Thorans?” “The R-ray destroys only animal tissue,” he replied, “while there is nothing that the T-ray may not dissipate. It is a most dangerous ray to work with because even the material of the gun barrel itself is not wholly impervious to it, and the only reason that it can be used at all is that its greatest force is expended along the line of least resistance, which in this case naturally is the bore of the gun. But eventually it destroys the gun itself.” “How is it fired?” I asked. He touched the crank at the end of the breech. “By turning this, a shutter is raised that permits radiations from element 93 to impinge on the charge, which consists of element 97, thus releasing the deadly T-ray.” “Why couldn’t we turn this gun about and rake the ship above deck,” I suggested, “thus wiping out the Thorans and giving us our freedom?” He pointed to a small, irregular hole in the end of the crank shaft. “Because we haven’t the key that fits this,” he replied. “Who has the key?” “The officers have keys to the guns they command,” he replied. “In the captain’s cabin are keys to all the guns, and he carries a master key that will unlock any of them. At least that was the system in the ancient Vepajan navy, and it is doubtless the same today in the Thoran navy.” “I wish we could get hold of the master key,” I said. “So do I,” he agreed, “but that is impossible.” “Nothing is impossible,” I retorted. He made no answer, and I did not pursue the subject, but I certainly gave it a lot of thought. As I worked, I noted the easy, noiseless propulsion of the ship and asked Kamlot what drove it. His explanation was long and rather technical; suffice it to say that the very useful element 93 (vik-ro) is here again employed upon a substance called lor, which contains a considerable proportion of the element yor-san (105). The action of vik-ro upon yor-san results in absolute annihilation of the lor, releasing all its energy. When you consider that there is eighteen thousand million times as much energy liberated by the annihilation of a ton of coal than by its combustion you will appreciate the inherent possibilities of this marvellous Venusan scientific discovery. Fuel for the life of the ship could be carried in a pint jar. I noticed as the day progressed that we cruised parallel to a coast line, after crossing one stretch of ocean where no land was in sight, and thereafter for several days I noted the same fact—land was almost always in sight. This suggested that the land area of Venus might be much greater in proportion to its seas; but I had no opportunity to satisfy my curiosity on that point, and of course I took no stock in the maps that Danus had shown me, since the Amtorians’ conception of the shape of their world precluded the existence of any dependable maps.