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.

"Oh, I'm going to fiddle around among those sweet-smelling chemicals,"
answered the young inventor.

"Bless my vest buttons! then I'm not coming in, exclaimed a voice which
could proceed from none other than Mr. Damon. And he it proved to be.
He had driven over from Waterford in his automobile and had arrived
just as the fire test was concluded.

"Oh, come on in!" called Tom. "You can visit with dad, and Eradicate
will be glad to see you."

"Poor Rad! How is he?" asked Mr. Damon, walking along with Tom and Ned.

"No change," was the sad answer of the young inventor, for he felt
responsible for the mishap to the colored man. "They can't operate on
his eyes yet."

"And when they do will he be able to see?" asked Mr. Damon.

"That is what we are all hoping," answered Tom with a sigh. "But do go
in to see him, Mr. Damon. It will cheer him up."

"I will," promised the eccentric man. "At any rate I'll not venture
near your perfume shop, Tom Swift!"

"And I don't see that I can be of any service