Some of these ghost-like creatures were twenty or thirty feet long, but it was difficult to tell their girth, for their outline was so hazy that it seemed to fade away into the air around them. These air-snakes were of a very light grey or smoke colour, with some darker lines within, which gave the impression of a definite organism. One of them whisked past my very face, and I was conscious of a cold, clammy contact, but their composition was so unsubstantial that I could not connect them with any thought of physical danger, any more than the beautiful bell-like creatures which had preceded them. There was no more solidity in their frames than in the floating spume from a broken wave.
"But a more terrible experience was in store for me. Floating downwards from a great height there came a purplish patch of vapour, small as I saw it first, but rapidly enlarging as it approached me, until it appeared to be hundreds of square feet in size. Though fashioned of some transparent, jelly-like substance, it was none the less of much more definite outline and solid consistence than anything which I had seen before. There were more traces, too, of a physical organization, especially two vast, shadowy, circular plates upon either side, which may have been eyes, and a perfectly solid white projection between them which was as curved and cruel as the beak of a vulture.
"The whole aspect of this monster was formidable and threatening, and it kept changing its colour from a very light mauve to a dark, angry purple so thick that it cast a shadow as it drifted between my monoplane and the sun. On the upper curve of its huge body there were three great projections which I can only describe as enormous bubbles, and I was convinced as I looked at them that they were charged with some extremely light gas which served to buoy up the misshapen and semi-solid mass in the rarefied air. The creature moved swiftly along, keeping pace easily with the monoplane, and for twenty miles or more it formed my horrible escort, hovering over me like a bird of prey which is waiting to pounce. Its method of progression--done so swiftly that it was not easy to follow--was to throw out a long, glutinous streamer in front of it, which in turn seemed to draw forward the rest of the writhing body. So elastic and gelatinous was it that never for two successive minutes was it the same shape, and yet each change made it more threatening and loathsome than the last.
"I knew that it meant mischief. Every purple flush of its hideous body told me so. The vague, goggling eyes which were turned always upon me were cold and merciless in their viscid hatred. I dipped the nose of my monoplane downwards to escape it. As I did so, as quick as a flash there shot out a long tentacle from this mass of floating blubber, and it fell as light and sinuous as a whip-lash across the front of my machine. There was a loud hiss as it lay for a moment across the hot engine, and it whisked itself into the air again, while the huge, flat body drew itself together as if in sudden pain. I dipped to a vol-pique, but again a tentacle fell over the monoplane and was shorn off by the propeller as easily as it might have cut through a smoke wreath. A long, gliding, sticky, serpent-like coil came from behind and caught me round the waist, dragging me out of the fuselage. I tore at it, my fingers sinking into the smooth, glue-like surface, and for an instant I disengaged myself, but only to be caught round the boot by another coil, which gave me a jerk that tilted me almost on to my back.
"As I fell over I blazed off both barrels of my gun, though, indeed, it was like attacking an elephant with a pea-shooter to imagine that any human weapon could cripple that mighty bulk. And yet I aimed better than I knew, for, with a loud report, one of the great blisters upon the creature's back exploded with the puncture of the buck-shot. It was very clear that my conjecture was right, and that these vast, clear bladders were distended with some lifting gas, for in an instant the huge, cloud-like body turned sideways, writhing desperately to find its balance, while the white beak snapped and gaped in horrible fury.