“There isn’t,” agreed Tom.  “But this isn’t that,” and Tom picked up the magazine and leafed it to find the article he had been reading.

“Let’s have a look at it,” suggested Ned.  “You act as though you might be vitally interested in it.  Maybe you’re thinking of joining forces with the professor again, as you did when you dug the big tunnel.”

“Oh, no.  I haven’t any such idea,” Tom said.  “I’ve got enough work laid out now to keep me in Shopton for the next year.  I have no notion of going anywhere with Professor Bumper.  Yet I can’t help being impressed by this,” and, having found the article in the magazine to which he referred, he handed it to his chum.

“Why, it’s by Bumper himself!” exclaimed Ned.

“Yes.  Though there’s nothing remarkable in that, seeing that he is constantly contributing articles to various publications or writing books.  It’s the story itself that’s so wonderful.  To save you the trouble of wading through a lot of scientific detail, which I know you don’t care about, I’ll tell you that the story is about a queer idol of solid gold, weighing many pounds, and, in consequence, of great value.”

“Of solid gold you say?” asked Ned eagerly.

“That’s it.  Got on your banking air already,” Tom laughed.  “To sum it up for you—­notice I use the word `sum,’ which is very appropriate for a bank—­the professor has got on the track of another lost or hidden city.  This one, the name of which doesn’t appear, is in the Copan valley of Honduras, and——­”

“Copan,” interrupted Ned.  “It sounds like the name of some new floor varnish.”

“Well, it isn’t, though it might be,” laughed Tom.  “Copan is a city, in the Department of Copan, near the boundary between Honduras and Guatemala.  A fact I learned from the article and not because I remembered my geography.”

“I was going to say,” remarked Ned with a smile, “that you were coming it rather strong on the school-book stuff.”

“Oh, it’s all plainly written down there,” and Tom waved toward the magazine at which Ned was looking.  “As you’ll see, if you take the trouble to go through it, as I did, Copan is, or maybe was, for all I know, one of the most important centers of the Mayan civilization.”

“What’s Mayan?” asked Ned.  “You see I’m going to imbibe my information by the deductive rather than the excavative process,” he added with a laugh.

“I see,” laughed Tom.  “Well, Mayan refers to the Mayas, an aboriginal people of Yucatan.  The Mayas had a peculiar civilization of their own, thousands of years ago, and their calendar system was so involved——­”

“Never mind about dates,” again interrupted Ned.  “Get down to brass tacks.  I’m willing to take your word for it that there’s a Copan valley in Honduras.  But what has your friend Professor Bumper to do with it?”

“This.  He has come across some old manuscripts, or ancient document records, referring to this valley, and they state, according to this article he has written for the magazine, that somewhere in the valley is a wonderful city, traces of which have been found twenty to forty feet below the surface, on which great trees are growing, showing that the city was covered hundreds, if not thousands, of years ago.”