Choking and gasping for breath, feeling as if they could not stand the intense heat more than a moment longer, the young inventor and his companions looked at each other. Death seemed ready to reach out and grasp them. The mass of heated air was so powerful that it swung and tossed the Red Cloud about as if it were a wisp of paper.  
"We must do something!" cried Mr. Damon, beginning to take off his collar and vest. "I'm choking!"
 
"Lie down in the bottom of the car," suggested Mr. Sharp. "The smoke won't trouble you so much there."
 
The eccentric man, too startled, now, to use any of his "blessing" expressions, did so.
 
"Can't you start the motor?" asked Tom frantically, as he stuck to his post, with his hand on the steering wheel, the elevation lever jammed back as far as it would go.
 
"I've done my best," answered the balloonist, gasping as he swallowed some smoke. "I'm afraid—afraid it's all up with us. We should have steered clear of this from the first. My, how it roars!"
 
The crackling and snapping of the flames below them, as they fed on the dry wood, which no rain had wet for weeks, was like the rush of some great cataract. Up swirled the dark smoke-clouds, growing hotter and hotter all the while as the craft came nearer and nearer to the center of the conflagration.
 
"We must rise higher!" cried Tom. "It's our only chance. Turn on the gas machine full power, and fill the container. That will carry us up!"
 
"Yes, it's our only hope," muttered Mr. Sharp. "We must go up, but the trouble is the gas doesn't generate so fast when there's too much heat. We're bound to have to stay over this fiery pit for some time yet."
 
"We're going up a little!" spoke Tom hopefully, as he glanced at a gauge near him. "We're fifteen hundred feet now, and we were only twelve a while ago."
 
"Good! Keep the elevation rudder as it is, and I'll see what I can do with the gas," advised the balloonist. "It's our only hope," and he hurried into the engine room, which, like the other parts of the cabin, was now murky with choking vapor and soot.
 
Suddenly the elevation gauge showed that they were falling. The airship was going down.
 
"What's the matter?" called Mr. Damon, from the cabin floor.
 
"I don't know," answered Tom, "unless the rudder has broken."
 
He peered through the haze. No, the big elevation rudder was still in place, but it seemed to have no effect on the shim.
 
"It's a down draught!" cried Mr. Sharp. "We're being sucked down. It won't last but a few seconds. I've been in 'em before."
 
He seemed to have guessed rightly, for, the next instant the airship was shooting upward again, and relief came to the aeronauts, though it was not much, for the heat was almost unbearable, and they had taken off nearly all their clothing.
 
"Lighten ship!" sung out Mr. Sharp. "Toss over all the things you think we can spare, Tom. Some of the cases of provisions—we can get more—if we need 'em. We must rise, and the gas isn't generating fast enough!"
 
There was no need for the young inventor at the steering wheel now, for the craft simply could not be guided. It was swirled about, now this way, now that, by the currents of heated air. At times it would rise a considerable distance, only to be pulled down again, and, just before Tom began to toss overboard some boxes of food, it seemed that the end had come, for the craft went down so low that the upward leaping tongues of flame almost reached the lower frame.
 
"I'll help you," gasped Mr. Damon, and while he and Tom tossed from the cabin windows some of their stores, Mr. Sharp was frantically endeavoring to make the gas generate faster.
 
It was slow work, but with the lightening of the ship their situation improved. Slowly, so slowly that it seemed an age, the elevation pointer went higher and higher on the dial.
 
"Sixteen hundred feet!" sung out Tom, pausing for a look at the gauge. "That's the best yet!"
 
The heat was felt less, now, and every minute was improving their situation. Slowly the hand moved. The gas was being made in larger quantities now that the heat was less. Ten minutes more of agony, and their danger was over. They were still above the burning area, but sufficiently high so that only stray wisps of smoke enveloped them.
 
"Whew! But that was the worst ever!" cried Tom, as he sank exhausted on a bench, and wiped his perspiring face. "We sure were in a bad way!"
 
"I should say so," agreed Mr. Sharp. "And if we don't get a breeze we may have to stay here for some time."
 
"Why, can't you get that motor to work yet?" asked Mr. Damon. "Bless my gaiters, but I'm all in, as the boys say."
 
"I'll have another try at the machine now," replied Mr. Sharp. "Probably it will work now, after we're out of danger without the aid of it."
 
His guess proved correct, for, in a few minutes, with the aid of Tom, the motor started, the propellers revolved, and the Red Cloud was sent swiftly out of the fire zone.
 
"Now we'd better take account of ourselves, our provisions, and the ship," said Mr. Sharp, when they had flown abo............