In another moment the wind was on her opposite side, and she was heading off at an angle to her previous course, while Harry with one foot braced against the lee coaming struggled to flatten in the sheet on the jib. The big mainboom had swung over of its own accord amidst a great clatter of blocks. By and by when the point slid away to lee of them Harry told Frank to pull his helm up, and then he pointed to a confused mass of gray rocks and trees rising above the glistening water several miles away. "Now," he said, "she'll go there straight, and all you have to do is to keep her bowsprit on yonder head. It's a fair wind, and when you've got that you want to slack out the sheets until the sails are as far outboard as they'll go and still keep full. If your sheets are too tight, you'll know it by the weight on the tiller." He let a couple of ropes run out through the clattering blocks, and the sloop, slanting over a little farther, seemed to leap forward. The sparkling green ridges which came tumbling up on one side of her swung her aloft with the foam boiling along the edge of her lee deck, and then surged away in turn and let her drop while another came rolling up. Instead of being a mere thing of wood and canvas she seemed to become animate, charged with vitality. The springy way she rushed along was strangely exhilarating. Frank became fascinated watching her bows go up and the snowy, straining sail sweep across the dazzling blue at every lurch, while he became conscious of a sense of control and mastery as he gripped the tiller. He felt that he could do what he wanted with this wonderful rushing thing. For she was certainly wonderful. There was no doubt of that, because among all of man's works and inventions there is none that more nearly approaches the simplicity of perfection and adaptability to its purpose than the modern sailboat. It has taken centuries to evolve her, each builder adding a little to the work of those who went before, and balancing in her making, often without knowing it, the great natural forces one against another, until at last science justified what man did, so that with this frail creation one may brave the untrammeled winds of heaven and the onslaught of the seas. By and by the headland they had been nearing thrust them off their course, and outside it lay a nest of islets, with a strong stream running up between. As it ran to windward it broke up the regular, breeze-driven waves into short, foaming combers with hollowed breasts and tumbling tops which flung up wisps of spray. Frank glanced at this tumult with some anxiety, and it was a relief to him when his companion offered to take the tiller. "You had better let me have her," Harry said. "She wants handling in a jump like that. I'd heave a reef down to reduce the sail, only that it would take us some time to tie it in and there'll be smoother water once we're past the islands. As we'll have to beat through, you can get the sheets in."