But no teacher save Professor Krenner was on the brow of the hill when the Sky-rocket was hauled into position again. This time Nan steered, with firmly braced feet, her mittened hands on the wheel-rim, and her bright eyes staring straight down the course.
"Are you ready?" cried the professor, almost as eager as the girls themselves. Then he blew the warning blast to tell all below on the hillside that the Sky-rocket was coming.
Ta-ra! ta-ra! ta-ra-ra-ra! Ta-rat!
With a rush the sled was off. It disappeared around the evergreen clump. The hum of its runners was dying away when suddenly there sounded a chorus of screams, evidently from the Sky-rocket crew. Following this, a crash and a turmoil of cries, expressing both anger and fright, rang out upon the lower hillside.
CHAPTER II
THE FAT MAN WITH HIS GROUCH
Nan Sherwood had steered this big bobsled down Pendragon Hill many times. She had no fear of an accident when they started, although the rush of wind past them seemed to stop her breath and made her eyes water.
There really was not a dangerous spot on the whole slide. It crossed but one road and that the path leading down to Professor Krenner's cabin. At this intersection of the slide and the driveway, Walter Mason had erected a sign-board on which had been rudely printed:
STOP! LOOK! LISTEN!
Few people traversed this way in any case; and it did seem as though those who did would obey the injunction of the sign. Not so a heavy-set, burly looking man who was tramping along the half-beaten path just as Nan and her chums dashed down the hill on the bobsled. This big man, whose broad face showed no sign of cheerfulness, but exactly the opposite, tramped on without a glance at the sign-board. He started across the slide as the prow of the Sky-rocket, with Nan clinging to the wheel, shot into view.