CHAPTER XV
A MILE A MINUTE
The moon, hanging low upon the horizon, was young but brilliant. The air was so keen and clear that without the help of the moonlight it seemed as though the stars must have flooded the lake with white light.
Nearer the southern shore the jingle of sleighbells and the laughter and shouting of the skaters marked the revelers who gave a free course to the ice-boats out here nearer the open water. For both east and west of Cavern Island, which lay in the middle of Lake Luna, opposite Centerport, the ice was either unsafe, or there were long stretches of open water. The freight boats up and down the lake kept this channel open.
But there was a wide and safer course before the flying aero-iceboat. And soon she was moving so fast that the girls heard nothing but the shriek of the wind rushing by.
Here and there before them lanterns glowed like huge fireflies. These lights were in the rigging of several ice-yachts. Chet and Lance had
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