"Does that thing work backwards?" demanded the amazed old
adventurer, as the taxi whizzed off before he could frame words to
express his indignation.

"Not often," replied Billy with a laugh. "I guess that chap reads
the papers and thought it wouldn't do him any good to try to fool a
particular friend of the Boy Aviators."

"Well, boys, what are your plans?" demanded Ben, as--after the
rugged fellow had been introduced to Mrs. Chester, a sweet-faced old
lady, and Mr. Chester, a fine-looking, gray-haired man of about
fifty--he and the boys sat in the garage discussing the African
outfit.

"We hardly know now," replied Frank, and then in a few words he
described Lathrop's letter and its contents.

"Wherever that boy is there's bound to be doings," remarked Ben,
sententiously, when the young leader had finished. "Down in Florida
when he wasn't tumbling into alligators' mouths or getting bit by
serpents he was allers up to some mischief--you mark my words
there's something in the wind now."

The boys talked late and long that night over the letter and what
possible plan Mr. Barr, the ivory importer, could have to discuss
that would be of interest to them, but they were able to arrive at
no definite conclusion except that there was nothing to be done
about it till morning.

As for Ben with his usual philosophic attitude toward mysteries, he