When they had been walking a while they came to Vin Island, where an old woman had sighted them from her window. She rushed from her cabin, waved them back, and shouted something which they could not hear. They understood perfectly well that she was warning them not to come any farther; but they thought there was no immediate danger. It would be stupid for them to leave the ice when all was going so well!
Therefore they went on past Vin Island and had a stretch of seven miles of ice ahead of them.
Out there was so much water that the children were obliged to take roundabout ways; but that was sport to them. They vied with each other as to which could find the soundest ice. They were neither tired nor hungry. The whole day was before them, and they laughed at each obstacle they met.
Now and then they cast a glance ahead at the farther shore. It still appeared far away, although they had been walking a good hour. They were rather surprised that the lake was so broad.
"The shore seems to be moving farther away from us," little Mats observed.
Out there the children were not protected against the wind, which was becoming stronger and stronger every minute, and was pressing their clothing so close to their bodies that they could hardly go on. The cold wind was the first disagreeable thing they had met with on the journey.
But the amazing part of it was that the wind came sweeping along with a loud roar—as if it brought with it the noise of a large mill or factory, though nothing of the kind was to be found out there on the ice. They had walked to the west of the big island, Valen; now they thought they were nearing the north shore. Suddenly the wind began to blow more and more, while the loud roaring increased so rapidly that they began to feel uneasy.
All at once it occurred to them that the roar was caused by the foaming and rushing of the waves breaking against a shore. Even this seemed improbable, since the lake was still covered with ice.
At all events, they paused and looked about. They noticed far in the west a white bank which stretched clear across the lake. At first they thought it was a snowbank alongside a road. Later they realized it was the foam-capped waves dashing against the ice! They took hold of hands and ran without saying a word. Open sea lay beyond in the west, and suddenly the streak of foam appeared to be moving eastward. They wondered if the ice was going to break all over. What was going to happen? They felt now that they were in great danger.
All at once it seemed as if the ice under their feet rose—rose and sank, as if some one from below were pushing it. Presently they heard a hollow boom, and then there were cracks in the ice all around them. The children could see how they crept along under the ice-covering.