The Fourth nodded and went down the steps, and the Second began walking up and down the bridge, every now and then taking another squint ahead. Again and again the mysterious shape crossed the disc of the sun, always vertically as though, whatever it might be, it was steering a direct course from the sun to the ship, its apparent rising and falling being due really to the dipping of her bows into the swells.
"Well, Mr. Charteris, what's the trouble?" said the Skipper as he reached the bridge. "Nothing wrong, I hope? Have you sighted a derelict, or what? Ay, what in hell's that!"
His hands went up to his eyes and he stared for a few moments at the pale yellow oblate shape of the sun.
At this moment the St. Louis' head dipped again, and the Captain saw something like a black line swiftly drawn across the sun from bottom to top.
"That's what I wanted to call your attention to, sir," said the Second in a low tone. "I first noticed it crossing the sun as it rose through the mist. I thought it was a spot of dirt on my glasses, but it has crossed the sun several times since then, and for some minutes seemed to remain dead in the middle of it. Later on it got quite a lot larger, and whatever it is it's approaching us pretty rapidly. You see it's quite plain to the naked eye now."
By this time several of the crew and of the early loungers on deck had also caught sight of the strange thing which seemed to be hanging and swinging between the sky and the sea. People dived below for their glasses, knocked at their friends' state-room doors and told them to get up because something was flying towards the ship through the air; and in a very few minutes there were hundreds of passengers on deck in all varieties of early morning costume, and scores of glasses, held to anxious eyes, were being directed ahead.
The glasses, however, soon became unnecessary, for the passengers had scarcely got up on deck before the mysterious object to the eastward at length took definite shape, and as it did so mouths were opened as well as eyes, for the owners of the eyes and mouths beheld just then the strangest sight that travellers by sea or land had ever seen.
Within the distance of about a mile it swung round at right angles to the steamer's course with a rapidity which plainly showed that it was entirely obedient to the control of a guiding intelligence, and hundreds of eager eyes on board the liner saw, sweeping down from the grey-blue of the early morning sky, a vessel whose hull seemed to be constructed of some metal which shone with a pale, steely lustre.
It was pointed at both ends, the forward end being shaped something like a spur or ram. At the after end were two flickering, interlacing circles of a glittering greenish-yellow colour, apparently formed by two intersecting propellers driven at an enormous velocity. Behind these was a vertical fan of triangular shape. The craft appeared to be flat-bottomed, and for about a third of her length amidships the upper half of her hull was covered with a curving, domelike roof of glass.
"She's an air-ship of some sort, there's no doubt about that," said the Captain, "so I guess the great problem has got solved at last. And yet it ain't a balloon, because it's coming against the wind, and it's nothing of the æroplane sort neither, because it hasn't planes or kites or any fixings of that kind. Still it's made of something like metal and glass, and it must take a lot of keeping up. It's travelling at a pretty healthy speed too. Getting on for a hundred miles an hour, I should guess. Ah! he's going to speak us! Hope he's honest."