There were several of these platforms, of various heights, placed at intervals in some spacious fields laid out specially near the city of Ivenia, for the use of those who were learning to fly, or experimenting with small flying-machines. They might be likened to the diving-platforms, with ladders leading up to them, which are to be seen at some bathing-places. They were open to all, and were freely used by old and young—especially the latter. It was no uncommon sight to see numbers of boys and girls—some almost babies—fluttering about like so many large butterflies.

This particular morning the two sailors were practising on their own account in one part, while Gerald and Jack were similarly engaged, not far away, under Alondra's tuition.

It was a windy day, with violent squalls at intervals, and lulls between. Just at the time Tom climbed to the platform there had arisen a very violent gust, which came sweeping across, bearing with it the figure of Jack, with large wings whirling about like the sails of a windmill. Whether he was purposely heading for the platform as a refuge to which he could cling, or whether the unexpected violence of the wind carried him there, it would be difficult to say. All that is certain about it is that he cannoned against Tom Clinch, and a moment later the two were gyrating and spinning in the air like a couple of gigantic bluebottles. Then, as though poor Bob Reid had not already enough bruises to attend to, the two descended like an avalanche plump on top of him. Finally, Gerald, who had followed Jack in his involuntary flight, sailed straight into the struggling group. Fortunately, at this point Alondra arrived. He had come after the two chums to render them his assistance, and was now able to help to disentangle them.

'One o' my wings is broke!' cried Tom, as he sat up and surveyed the wreck.

'I'm afraid both mine are,' said Jack.

'You 've broke my back atween ye!' Bob spluttered, as he rolled over. 'This settles it! No more flyin' fur me!'

'I've had enough for to-day too!' Jack laughingly owned, as he proceeded to divest himself of his flying outfit. 'It's a mistake for beginners to practise on a windy day.'

'I doan't practise no more—wind or no wind,' Bob declared in a tone of conviction. 'All I wants now be some limbrokation—an' plenty on it!'

'I think you only require a little more practice,' Alondra afterwards assured the two chums, as they were walking home towards his yacht, leaving their outfits to be brought after them by the two sailors.

'I don't know,' said Jack doubtfully. 'We've been trying it for a good while now, and we don't seem to make much progress. I begin to doubt if we ever shall. It's different with you, you see. Your people have learnt it more or less for generations, and it's in the blood, I fancy. I think we shall have to be content with motor-wings.'