The air-ship had by this time covered a little over 2000 miles of her voyage, and was now speeding smoothly and swiftly along over the south-western shore of the Red Sea, a few miles southward of the sixteenth parallel of latitude. Eastward the bright blue waves of the sea were flashing behind them in the cloudless morning sun; the high mountains of the African coast rose to right and left and in front of them; and through the breaks in the chain they could see the huge masses of Abyssinia to the southward, and the vast plains that stretched away westward across the Blue and White Niles, away to the confines of the Libyan Desert. "What a glorious world!" exclaimed Natasha, after gazing for many silent minutes with entranced eyes over the limitless landscape. "And to think that, after all, all this is but a little corner of it!" "It is yours, Natasha, if you will have it," replied Arnold quietly, yet with a note in his voice that warned her that the moment which she had expected and yet dreaded, had already come. There was no use in avoiding the inevitable for a time. It would be better if they understood each other at once; and so she looked round at him with eyebrows elevated in well-simulated surprise, and said-- "Mine! What do you mean, my friend?" There was an almost imperceptible emphasis on the last word that brought the blood to Arnold's cheek, and he answered, with a ring in his voice that gave unmistakable evidence of the effort that he was making to restrain the passion that inspired his words-- "I mean just what I say. All the kingdoms of the world, and the glory of them, from pole to pole, and from east to west, shall be yours, and shall obey your lightest wish. I have conquered the air, and therefore the earth and sea. In two months from now I shall have an aërial navy afloat that will command the world, and I--is it not needless to tell you, Natasha, why I glory in the possession of that power? Surely you must know that it is because I love you more than all that a subject world can give me, and because it makes it possible for me, if not to win you, at least not to be unworthy to attempt the task?" It was a distinctly unconventional declaration--such a one, indeed, as no woman had ever heard since Alexander the Great had whispered in the ears of Lais his dreams of universal empire, but there was a straightforward earnestness about it which convinced her beyond question that it came from no ordinary man, but from one who saw the task before him clearly, and had made up his mind to achieve it. For a moment her heart beat faster than it had ever yet done at the bidding of a man's voice, and there was a bright flush on her cheeks, and a softer light in her eyes, as she replied in a more serious tone than Arnold had ever heard her use--