my head is so full of my new gyroscope plans. There is a certain
spring I can't seem to get right--"

"Perhaps you'd better see what Andy wants," suggested Mr. Damon
gently. He looked at Tom. They were both thinking of the same thing.

"I will," replied Mr. Swift quickly, and he passed into the library.

"I wonder how much Andy heard?" asked Ned, in a low voice.

"Oh, I don't believe it could have been very much," answered Tom.

"No, I stopped you just in time," rejoined his chum, "or you might
have blurted out the name of the city near where the buried gold
is."

"Yes, we must guard our secret well, Tom," put in Mr. Damon.

"Well, Andy couldn't have known anything about the letter I got,"
declared Tom, "and if he only heard snatched of our talk it won't do
him much good."

"The only trouble is he's been there long enough to have heard most
of it." suggested Ned. They could talk freely now, for in going into
the parlor Mr. Swift had tightly closed the door after him. They
could just hear the murmur of his voice speaking to Andy.

"Well, even if he does guess about the city of gold, and its
location, I don't believe he'll try to go there," remarked Tom,
after a pause.