"Oh Tom, is it really safe?"

A young lady--an exceedingly pretty young lady, she could be called-- stood with one small, gloved hand on the outstretched wing of an aeroplane, and looked up at a young man, attired in a leather, fur-lined suit, who sat in the cockpit of the machine just above her.

"Safe, Mary?" repeated the pilot, as he reached in under the hood of the craft to make sure about one of the controls."Why, you ought to know by this time that I wouldn't go up if it wasn't safe!""Oh, yes, I know, Tom.It may be all right for you, but I've never been up in this kind of airship before, and I want to know if it's safe for me."The young man leaned over the edge of the padded cockpit, and clasped in his rather grimy hand the neatly gloved one of the young lady.And though the glove was new, and fitted the hand perfectly, there was no attempt to withdraw it.Instead, the young lady seemed to be very glad indeed that her hand was in such safe keeping.

"Mary!" exclaimed the young man, "if it wasn't safe--as safe as a church--I wouldn't dream of taking you up!" and at the mention of "church" Mary Nestor blushed just the least bit.Or perhaps it was that the prospective excitement of the moment caused the blood to surge into her cheeks.Have it as you will.

"Come, Mary! you're not going to back out the last minute, are you?" asked Tom Swift."Everything is all right.I've made a trial flight, and you've seen me come down as safely as a bird.You promised to go up with me.I won't go very high if you don't like it, but my experience has been that, once you're off the ground, it doesn't make any difference how high you go.you'll find it very fascinating.So skip along to the house, and Mrs.Baggert will help you get into your togs.""Shall I have to wear all those things--such as you have on?" asked Mary, blushing again.

"Well, you'll be more comfortable in a fur-lined leather suit," asserted Tom."And if it does make you look like an Eskimo, why I'm sure it will be very becoming.Not that you don't look nice now," he hastened toassure Miss Nestor, "but an aviation suit will be very--well, fetching, I should say.""If I could be sure it would 'fetch' me back safe, Tom--""That'll do! That'll do!" laughed the young aviator."One joke like that is enough in a morning.It was pretty good, though.Now go on in and tog up.""You're sure it's safe, Tom?"

"Positive! Trot along now.I want to fix a wire and--""Oh, is anything broken?" and the girl, who had started away from the aeroplane, turned back again.

"No, not broken.It's only a little auxiliary dingus I put on to make it easier to read the barograph, but I think I'll go back to the old system.Nothing to do with flying at all, except to tell how high up one is.""That's just what I don't care to know, Tom," said Mary Nestor, with a smile."If I could imagine I was sailing along only about ten feet in the air I wouldn't mind so much.""Flying at that height would be the worst sort of danger.You leave it to me, Mary.I won't take you up above the clouds on this sky ride; though, later, I'm sure you'll want to try that.This is only a little flight.You've been promising long enough to take a trip with me, and now I believe you're trying to back out.""No, really I'm not, Tom! Only, at the last minute, the machine looks so small and frail, and the sky is so--big--"She glanced up and seemed to shiver just a trifle.

"Don't be thinking of those things, Mary!" laughed Tom Swift."Trot along and get ready.The motor never worked better, and we may break a few speed records this morning.No traffic cops to stop us, either, as there might be if we were in an auto." "There you go, Mary !" exclaimed Tom, as if struck with a new thought."You've ridden in an auto with me many a time, and you never were a bit afraid, though we were in more danger than we'll be this morning.""Danger, Tom, in an auto? How?"

"Why, danger of a wheel collapsing as we were going full speed; or the steering knuckle breaking and sending us into a tree; danger of runninginto a stone wall or a ditch; danger of some one running into us, or of us running into some one else.There isn't one of these dangers on a sky ride.""No," said Mary slowly."But there's the danger of falling.""One against twenty.That's the safety margin.And, if we do fall, it will be like landing in a feather bed! There, don't wait any longer.Go and get ready."Mary sighed, and then, seeming to summon her nerve to her aid, she smiled brightly, waved her hand to Tom, and hastened toward his home, where Mrs.Baggert the matronly housekeeper, was waiting to help the girl attire herself in a flying-suit of leather.

Mary Nestor, who had a very warm place in the heart of Tom Swift, had, as he stated, some time since promised to take a trip in the air with the young inventor.But she had kept putting it off, for one reason or another, until Tom began to despair of ever getting her to accompany him.To-day, however, when she had called to inquire about his father, who had been slightly ill, Tom had, after the social visit, insisted on the promise being kept.

He had his mechanic get out one of the safest, though a speedy, double machine, and, with Mary to watch, Tom had taken a trial flight, just to show her how easy it was.It was not the first time she had seen him take to the air, but now she watched with different emotions, for she was vitally interested.