They come among a people who have used their heads.
From these people they learned to heat a banana stand with a little coal stove.

Having mastered that coal-stove principle, they are going back to their native hills with black magic up their sleeves.
"What a superior man am I," thought that young tribesman swollen with vanity, although he had done nothing.
This taught me that some of these thick-headed tribes can be all swelled up with pride when they have little to be proud of..