“No, but I just happened to think that I nailed my watch up in that last box.”

“Nailed up your watch!” cried Mr. Preston, who, after a trip to New York to make arrangements for passages on a steamer, had come back to help Tom pack up.

“Yes, I took it out to see how long it took me to make a box cover, and then Tom asked me to nail up that box containing the motor parts, and I laid my watch right down on top, and put the boards over it.”

“Well, the only thing to do is to take off the cover,” remarked Tom grimly.

“Bless my chronometer!  That will delay things,” said the odd man with a sigh.  “But I suppose there is no hope for it,” and he proceeded to open the box, while Tom, Ned, the circus man and Eradicate busied themselves over the hundred and one things to be done before they would be ready for the trip to the interior of South America.

“Look out, Ned!” called Tom.  “You’re making those top boards too long.  They’ll stick out over the edge, and be ripped off if the box catches on anything.”

“Yes, you can’t be too careful,” cautioned Mr. Preston.  “Each box or package must be the right weight, or the porters and mule drivers won’t carry them into the interior.  You may have to cross rough trails, and even ford rivers.  And as for bridges! well, the less said about them the better.  You aren’t going to have any picnic, and if you want to back out, Tom Swift, now is the time to say so.”

“What!  Back out?” cried our hero.  “Never!  I said I’d go and I’m going.  Ned, pass that brace and bit over, will you.  I’ve got to bore a hole for these screws.”

And so the work went on in the big aeroplane shed, which they had made their packing headquarters.

The Lark, that small, but strong and speedy aeroplane, had been safely packed, and most of it had been sent on ahead to New York, where the travellers were to take the steamer.  There remained to be transported their clothing, weapons and ammunition, and several bundles and cases of trinkets which would be of more value in bartering with the natives than money.  Tom and Mr. Preston had selected the things with great care, and at the last moment the young inventor had packed a box of his own, and said nothing about it.  Included in it were some of his own and his father’s inventions, and had one been given a glance into that same box he would have wondered at the queer things.

“What in the world are you taking with you, anyhow?” asked Ned, of his chum, noticing the mysterious box.

“’You’ll see, if we ever get to giant land,” replied Tom with a smile.

“How long before we can start?” asked Mr. Damon, late that day, when most of the hard work had been finished.  He was as anxious and as eager as either of the youths to make a start.

“We ought to be ready at least a week from to-day,” replied Tom, “and perhaps sooner.”

“Sooner, if you can make it,” suggested Mr. Preston.  “The steamer sails a week from to-day, and if you miss that one you’ll have to wait two weeks more.”