Whether they would be able to continue to travel thus so long as the storm should last was another matter—as also was the question of where they were being carried. They had no control over their course, no idea of what their ultimate destination was likely to be, no possible means of arresting their wild career. To have ventured on a lower course, nearer the ground, in the hope of stopping, would have meant certain death.

Nor could they so much as speak to one another. They were all roped together, it is true, and this proved a very wise precaution, for without it they would undoubtedly have quickly become separated and hopelessly lost to one another. Malto had left plenty of rope between each, and this was now extended to its utmost, leaving too great an interval to permit even of shouting. They all looked to Malto—who was in the centre—for guidance; and he conveyed his directions and advice by signs.

Of other fliers, or of airships of any kind, they saw none. It was the custom to send warnings ahead in such case, and for all air-craft to seek shelter until the storm had passed.

The wings they had found and appropriated were a sort of combination—that is to say, they were supplied with electric motors, but could also be used as ordinary wings when the supply of electricity stored in the batteries ran out, just as one can work a motor-cycle with one's feet. At present the travellers were husbanding their power carefully, using only just enough to keep them at what seemed to be a safe height.

It had been Malto's hope, when they had started, that the storm would not continue in such fury for any length of time. But this expectation proved to be delusive. Hour after hour passed, and still they were carried along at a pace which would have rendered any attempt at stopping sheer madness. Cities and towns had long disappeared; villages, even, now seemed to be no more. The ground became hilly, and less and less cultivated till they came upon a region which was little more than a rocky desert. Here the hills were growing into mountains; and some of these towered up to such a height that possible collision with their rocky peaks became a very ugly possibility.

Malto grew alarmed, and signalled to his companions to ascend yet higher. Upwards they mounted accordingly, and passed into the midst of the swirling clouds. Here they were in a thick mist, but presently, to Malto's relief, they struck into an upper current free from cloud, and there they entered a region of perfect calm.

They could now even talk, and look round, and take rest of a sort. The sun was shining, and everything was bright and cheerful. Beneath their feet they could see nothing save great masses of sombre, heavy-looking clouds scurrying furiously onwards.

'Whew!' Jack uttered a long whistle of relief. 'This is a change indeed! I began to wonder where on Earth—h'm, I mean where on Mars—we were rushing to! Where do you suppose we 've got to? I mean, supposing we dropped straight down, what part of your world should we be in?' He asked the question in a general sort of way, and Malto answered him as vaguely, by admitting frankly that he had not the least idea.

'I confess I 've lost count of all landmarks,' he declared. 'I am very much afraid we are now near what is known as the Great Desert. It is a more or less waterless tract which is uninhabited, save by some roaming tribes of wanderers who do not bear the best of characters.'

'Ha! You have deserts, then, as we have?' said Gerald.