"Boys, open his mouth while I pour the medicine down him," gritted the Professor.
They required no urging to do the Professor's bidding. Tad and Ned ranged themselves on either side of the patient, while Chunky sat on the guide's feet. Almost before he was aware of their purpose the boys had pried his jaws open and into the opening thus made professor Zepplin dropped the concoction he had mixed.
The effect was electrical. Juan leaped to his feet as if elevated by springs, uttering a yell that might have been heard a mile or more on the open plain. But Juan did not run in a circle this time. Acting upon the mathematical theory that a straight line is the shortest distance between two points, the guide made a break for the spring, howling like a madman. The Pony Rider Boys looked on in amazement.
Juan fell on his knees before the spring, dipping up the water in his hands.
"What did you give him, professor?" grinned Tad.
"Hot drops!" answered the man of science tersely.
"Not that stuff you fed me when I ate too much honey in the Rockies?" questioned Stacy.
"The same."
"Wow! I had ten drops and it felt like a pailful when it got inside of me."
"How much did you give Juan?" questioned Walter.