"I know, Father. But that explosive is in double vacuum containers, and it will be safe for some time yet. Besides, it's in the cellar. It's the carbide I'm most worried about. We daren't use water." "But something will have to be done!" exclaimed Mr. Damon. "Bless my red necktie, if we don't--" "Better get back a way," suggested Tom. "Something may go off!" His words of warning had their effect, and the whole circle moved back several paces. "Is there anything of value in the shed?" asked Ned. "I should say there was!" Tom answered. "I hoped we could get some of them out, but we can't now--until the fire dies down a bit, at any rate." "Look, Tom! The pattern shop roof is catching!" shouted Mr. Swift, pointing to where a little spurt of flame showed on the roof of a distant building. "It's from sparks!" Tom said. "Any danger of using water there?" Ned wanted to know. "No, use all you like! That's the only thing to do. Come on, you with the hose!" Tom yelled. "Save the other buildings!" "But are you going to let the red shed burn?" asked Mr. Swift. "You know what it means, Tom." "Yes, Father, I know. And I'm going to fight that fire in a new way. But we must save the other buildings, too. Play water on all the other sheds and structures!" ordered the young inventor. "I'll tackle this one myself. Oh, Ned!" he called. "Yes," answered his chum. "What is it?" "You take charge of protecting the place where the new aerial warship is stored. Will you? I can't afford to lose that." "I'll look after it, Tom. No harm in using water there, though; is there?" "Not if you don't use too much. Some of the woodwork isn't varnished yet, and I wouldn't want it to be wet. But do the best you can. Take Koku and Eradicate with you. They can't do any good here." "Do you mean to say you're going to give up and let this burn?" "Not a bit of it, Ned. But I have another plan I want to try. Lively now! The wind's changing, and it's blowing over toward my aerial warship shed. If that catches--" Tom shook his head protestingly, and Ned set off on the run, calling to the colored man and the giant to get out another line of hose. "I wonder what Tom is going to do?" mused Ned, as he neared the big shed he and the others had left on the alarm of fire. Tom, himself, seemed in no doubt as to his procedure. With one look at the blazing red shed, as if to form an opinion as to how much longer it could burn without getting entirely beyond control, Tom set off on a run toward another large structure. Ned, glancing toward his chum, observed: "The dirigible shed! I wonder what his game is? Surely that can't be in danger--it's too far off!" Ned was right as to the last statement. The shed, where was housed a great dirigible balloon Tom had made, but which he seldom used of late, was sufficiently removed from the zone of fire to be out of danger.