Frank found this no easy task, for he had no idea that the sails could pull so hard, and Harry had to help him with one hand. Then the latter's face became intent as they plunged into the turmoil. The seas looked big and angry now. In fact, as usually happens, they looked a good deal bigger than they really were, but they were breaking in a threatening manner and came on to meet the sloop in white-topped phalanxes. She went over some with a disconcerting plunge and swoop, but she rammed a few of the rest, driving her jib and bows in and flinging the brine all over her when she swung them up. Her deck was sluicing, and every now and then a green and white cascade came frothing over the coaming into the well. Frank, however, noticed that, instead of letting the boat meet the combers, his companion occasionally pulled his tiller up, so that, swinging round a little, she brought the ridge of frothing water farther on her side as she plunged over it. "I thought you had to face a nasty sea head-on," he said. "Did you?" Harry responded. "Then watch that smaller one." A slope of water came tumbling on some yards ahead, and as the boy eased his helm down an inch or two the bows came up to meet the sea. They struck it full in its hollowed breast, and the next moment there was a shock and half the deck was lost in a rush of foam. "Like me to plug another?" laughed Harry. Frank begged him not to do it. The result of the experiment was rather alarming, and Harry let her fall off a little to dodge the onslaught of the succeeding combers, until at last they grew smaller as the stream spread itself out in open water. Then he gave Frank some further instruction. "If you were pulling or paddling a small craft it would be safer to bring her head-on, because you have to remember that she'd be going mighty slow, but when you're sailing a boat that's carrying her speed it's evident that you don't want to ram her right at a comber. If you do, she's bound to go bang into it. When you see one that looks threatening you let her fall off slightly and she goes over slanting." He broke off for a moment with a laugh. "Seems to me I'm always on the 'teach.' You come here and take the tiller while I get some of the water out of her. You can head for that point to starboard." He busied himself with the bucket while Frank steered the boat, and an hour or so later they ran into a little sheltered inlet where they brought her head to wind and pitched the anchor over. After that they bailed out the half-swamped canoe, and, dropping into her, paddled ashore. CHAPTER VII A WARNING