"Pooh!" sneered Carl, throwing a contemptuous glance at Jacob. "Who's tired? We can rest all night in Leyden."

Ludwig and Lambert looked anxious and disappointed. It was no slight thing to lose the credit of having skated all the way from Broek to the Hague and back again, but both agreed that Jacob should decide the question.

Good-natured, tired Jacob! He read the popular sentiment at a glance.

"Oh, no," he said in Dutch. "I was joking. We will skate, of course."

The boys gave a delighted shout and started on again with renewed vigor.

All but Jacob. He tried his best not to seem fatigued and, by not saying a word, saved his breath and energy for the great business of skating. But in vain. Before long, the stout body grew heavier and heavier--the tottering limbs weaker and weaker. Worse than all, the blood, anxious to get as far as possible from the ice, mounted to the puffy, good-natured cheeks, and made the roots of his thin yellow hair glow into a fiery red.

This kind of work is apt to summon vertigo, of whom good Hans Anderson writes--the same who hurls daring young hunters from the mountains or spins them from the sharpest heights of the glaciers or catches them as they tread the stepping-stones of the mountain torrent.