difference, because, from what I've seen of Shea, I imagine he sleeps on
his post. I'm glad we didn't let him inside, because, like all Irishmen,
he is fond of his pipe and might have set fire to the shed. It's
dangerous smoking where there's a lot of gasoline about."

"Of course we've got that Puss Carberry and his mean crony, Sandy
Hollingshead, to consider. They tried to injure our machine once and
might again, especially after what happened today," said Andy, throwing
one leg over his saddle and standing there a minute.

"Oh, I guess not, Andy. They understand that we're keeping tabs of that
hangar, with its precious contents. Besides, they've got their hands
full of other matters, if what Puss said about that big trip to the
Amazon country is true."

The other sighed.

"I only wish I was as sure of going down there as Puss seems to be," he
observed. "I don't know how it is, but something queer seems to be
drawing me that way. Day and night I have pictures rising in my
mind. I've read every scrap concerning the Isthmus and northern coast of
South America, until I guess I'm as well posted on such things as one
who had been there."

"Yes," said Frank, softly, "and I'm afraid you let your mind dwell too
much on that subject, old chum. It's more than a year now since your
father disappeared. And the chances of your ever finding what became of
him are like searching for a lost diamond in the sand of the
seashore. It's affecting your mind, Andy. You look all fagged out. I
wish you could cheer up and be something like your old self."