’Nerves again!’ murmured Jack sleepily. ’We shall be all right! We go as the king’s guests or ambassadors, or whatever it is; and not even the Ogre will dare to harm us. Ivanta has a long arm, it strikes me.’ ’Maybe he has, and maybe it will, as you say, be all right,’ was Gerald’s reply. ’All the same, something tells me we’re in for trouble in some way or another.’ *CHAPTER XVIII.* *A ROYAL PROGRESS.* ’There are the famous canals—the great waterways which the astronomers of the Earth have seen through their telescopes and puzzled over for so many years. The curious thing is that the scientists of Mars have puzzled over them almost as much, and can tell you practically just as little about them.’ Thus spoke Monck, as the _Lokris_ sailed through the upper air on her way to the country of King Agrando. Below them the voyagers saw seas and continents spread out as upon an enormous map. And there, quite plain to the eye, were the strange channels Monck had referred to. They looked like great arms of the sea; but there was that in their regular shape which proclaimed, even to the unscientific eye, that they must have been constructed artificially. ’Their origin is lost in the mists of past ages,’ Monck explained. ’Some mighty race in the past must have made them at a time when to be able to travel by water was all-important.’ Jack, who was looking through a powerful telescope, exclaimed in surprise, ’I can see vessels going about on them! The curious thing is that in one channel they are all going one way, and in the other channel they are all moving along in the opposite direction.’ ’Exactly!’ Monck replied. ’And that, you perceive, seems to suggest a reason for their construction. There are strong currents running through them just as you see the vessels going—that is to say, in opposite directions. It is supposed that the ancients, in the days before mechanical propulsion was invented, saw in that fact an easy way of getting about. At any rate, that is the general supposition nowadays. Of course, it is only a guess.’ The _Lokris_ had been at this time two days and nights on her journey. She was accompanied by several airships, forming, in effect, a small squadron. ’Escorted’ would be perhaps a more fitting term, for several of them were war-vessels, while others again were craft in attendance, carrying supplies. The progress of the whole fleet was methodical, and was conducted with a good deal of ceremony. It was all ordered very much as would be the case with the fleet of one of the Great Powers on Earth escorting the yacht carrying the son of a powerful monarch on a visit or tour to a distant realm. One of the war-vessels carried the Diamond King and his party; while Armeath and his wards travelled with Prince Alondra in his yacht.