"Professor, hadn't you better fetch your medicine case and dose him
up?" asked Tad.

"Yes, I'll attend to him."

"Give him a good dose while you are about it," urged Ned. "Something
that will cure his laziness at the same time."

The Professor brought his case; then, remembering something else in
his kit that he wanted, he laid the case down and hurried back to his
tent. However, Stacy opened the case, selecting a bottle, apparently
at random, drew the cork and held the bottle under Juan's nose.

"Smell of this, my son. It'll cure your estomago on the run."

"Be careful, Chunky, what are you doing there?" warned Tad. "You
shouldn't fool with the medicines. You--"

His further remarks were cut short by a sudden yell of terror and pain
from Juan.

The guide leaped to his feet choking, gasping, while the tears ran
down his cheeks as he danced about as if suddenly bereft of his
senses.

"Now you've gone and done it," growled Ned. "He never moved so fast in
his life, I'll wager."

Juan was running in a circle now, shrieking and moaning. Professor
Zepplin approached them in a series of leaps. He could not imagine