"Very well, Superior."
It was done by means of an extremely faint humming device, reminding the geologist of certain wireless apparata he had heard. Not a word was actually spoken by either Sanusian.
Van Emmon kept a close watch upon the conning tower on the other machine. The sun was shining upon it in such a fashion that its gleam made inspection very difficult. Once he fancied that he could make out a short, compact figure within the "eye"; but he could not be sure. The glass, or whatever it was, reflected everything within range.
Was the airman a quadruped? Did he sit or stand upright, like a man? Or did he use all four limbs, animal-fashion? Van Emmon had to admit that he could not tell; no wonder he didn't guess the truth.
Shortly after receiving the summons, the geologist's agent changed his direction slightly; and within ten minutes the machine was passing over a large grain field. On the far edge was a row of trees, and it was toward this that the Sanusian proceeded to volplane, presently coming to another nausea-producing stop. Once more Van Emmon was temporarily helpless.
When he could look again, he saw that the machine had landed upon a steep slope, this time with its nose pointing upward. Far above was what looked like a cave, with a growth of some queer, black grass on its upper rim. The craft commenced to move upward, over a smooth, dark tan surface.
In half a minute the machine had reached the top of the slope, and the geologist looked eagerly for what might lie within the cave. He was disappointed; it was not a cave at all. Instead, another brown slope, or rather a bulging precipice, occupied this depression.
Van Emmon looked closer. At the bottom of this bulge was a queer fringe of the same kind of grass that showed on top of it. Van Emmon looked from one to the other, and all of a sudden the thing dawned upon him.
This stupendous affair was no mountainside; it was neither more nor less than the head of a colossal statue! A mammoth edition of the Goddess of Liberty; and the aircraft had presumed to alight upon its cheek!
The machine clung there, motionless, for some time, quite as though the airman knew that Van Emmon would like to look a long while. He gazed from side to side as far as he could see, making out a small section of the nose, also the huge curves of a dust-covered ear. It was wonderfully life-like.