"What can you do about it?" Ned wanted to know.
"Oh, I've got another bomb up there," and Tom pointed to his helper who was still perched on the overhanging arm. "I was prepared for some such emergency as this. Drop the other one!" Tom yelled, and again a dark object fell, bursting in the pit and again liberating the gas that was supposed to choke any fire.
The flames that had started up for the second time instantly died down, and Ned, leaning over the edge of the pit, cried:
"Hurray, Tom! That does the business!" But the young inventor shook his head. "I'm not quite satisfied," he remarked. "It didn't work quickly enough. What I want is a chemical combination that will choke the fire off first shot."
"Well, you pretty nearly have it," observed Ned.
"Yes. But 'good enough' isn't what I want," Tom said. "I've got to work on that chemical compound again. I think I know where I can improve it."
"Well, if I were a fire, and I had this happen to me," remarked Ned, laughing and pointing to the heap of blackened embers in the pit, "I should feel very much discouraged."
"But not enough," declared Tom. "I want the fire to be out more quickly than this one was. I think I can improve that chemical compound, and I'm going to do it."
"All right! Come on down!" he called to his helper, who was still perched on the overhanging arm. "We won't do any more today."
"What is your next move?" asked Ned, as Tom started for his small, private laboratory.