The course was a triangular one of three miles, and now all the craft that were competing were on the last "leg" of the triangle.
"We're creeping up on her!" whispered Amy, as she directed the attention of Grace to the boat just ahead of them. It was a light, open affair, with a two-cylinder motor, but speedy, and two girls in it seemed to be working desperately over their machinery. Something seemed to have gone wrong with one of the cylinders, for Betty could detect a "miss" now and then.
"Yes, we're coming up," admitted Grace, as she skillfully put a little oil on a cam shaft. "If we can only hold out!"
"Oh, trust Betty for that."
"It isn't that—it's the motor. One never knows when they are not going to 'mote.' But this one seems to be coming on well," and Grace glanced critically at the various parts.
They were well out in Rainbow Lake now, and many eyes were watching the race. One of the last boats to get away had given up, for the girls in charge could not remedy the ignition trouble that developed soon after they started. This left five. The Gem was second in line, but behind her a very powerful boat was gradually creeping up on her, even as she was overhauling the boat that got away first.
