"But—but," spluttered Professor Scotch, "what is making her move—what is propelling her?"
"That's a mystery!" came from Frank, "but it's a mystery I mean to solve! Get out your paddle, professor. Keep straight after that canoe, Barney. We'll run her down and look her over."
Then a strange race began, canoe against canoe, the one in the lead apparently empty, the one pursuing containing three persons who were using all their strength and skill to overtake the empty craft.
"The white canoe had stopped, and was lying calmly on the inky surface of the shadowed water." (See page [147])
CHAPTER XXVI.
STILL MORE MYSTERIOUS.
"Pull!" panted Frank.