He looked at her all over, from the top of the mast to the tiller, and he could not discover anything. Bevis walked up and down, he worked himself quite into a fidget. He went into the wood a little way, half inclined to go after Mark as he felt so restless. All at once he took out his pocket-book and pencil and sat down on the ground just where he was, and drew a sailing-boat such as he had seen. Then he went back to the shore, and sketched their boat on the other leaf. His idea was to compare the sailing-boats he had seen with theirs. When he had finished his outline drawing he saw directly that there were several differences. The mast in the boat sketched from memory was much higher than the mast in the other. Both sails, too, were larger than those he had had made. The bowsprit projected farther, but the foresail was not so much less in proportion as the mainsail. The foresail looked almost large enough, but the mainsail in the boat was not only smaller, it was not of the same shape. In his sketch from memory the gaff or rod at the top of the sail rose up at a sharper angle, and the sail came right back to the tiller. In the actual boat before him the gaff was but little more than horizontal to the mast, and the sail only came back three-fourths of the distance it ought to have done. “It must be made bigger,” Bevis thought. “The mainsail must be made ever so much larger, and it must reach to where I sit. That’s the mistake--you can see it in a minute. Mark! Mark!” He shouted and whistled. Mark came presently running. “I’ve been all round,” he said panting, “and I’ve--” “This is it,” said Bevis, holding up his pocket-book. “I’ve seen a huge jack--a regular shark. I believe it was a shark--and three young wild ducks, and some more of those parrots up in the trees.” “The mainsail--” “And something under the water that made a wave, and went along--” “Look, you see it ought to come--” “What could it have been that made the wave and went along?” “O! nothing--only a porpoise, or a seal, or a walrus--nothing! Look here--” “But,” said Mark, “the wave moved along, and I could not tell what made it.” “Magic,” said Bevis. “Very likely the magician. Did you see him?” “No; but I believe there’s something very curious about this island--” “It’s enchanted, of course,” said Bevis. “There’s lots of things you know are there, and you can’t find,” said Mark; “there’s a tiger, I believe, in the bushes and reeds at the other end. If I had had my spear I should have gone and looked, and there’s boa-constrictors and a hippopotamus was here last night, and heaps of jolly things, and I’ve found a place to make a cave. Come and see,” (pulling Bevis). “I’ll come,” said Bevis, “in a minute. But just look, I’ve found out what was wrong--” “And how to tack?” “Yes.” “Then let’s do it, and tack and get shipwrecked, and live here. If we only had Jack’s rifle.”