"What!" cried Frank, "you think--"
"I don't think, Frank, my boy, I am reasoning from analogy, as it were. First and foremost, it is not for nought the glaud whistles."
"I don't hitch on," said the Cockney boy.
"The glaud," said Conal by way of explanation, "is a wild Scottish hawk, that always whistles aloud before darting on his prey."
"The glaud in this case," said Duncan, "is the Portuguese, who never go into any savage country except for the sake of treasure or plunder.
"Secondly," he continued, "if the band were all massacred, they doubtless had hidden their dust, and it is evidently there still. Thirdly, these cannibal outcasts care nothing for gold, and would at any time give a large and valuable diamond for a coloured bead."
"I do declare," cried Frank, "I sha'n't sleep a wink to-night for thinking of all this. Duncan, you are clever!"
"Have you only just found that out?" said Conal, laughing. Conal was proud of his brother.
"And now," said Duncan, "shall we, after a few days of exploration, get into the balloon once more, and try to find our way to the sea-shore."
"Before I could answer that question myself," he added, "I would like to think it all out, and so I move that we curl up."