Unpredictable as the wind, the man was all smiles when he returned with the two jars filled with water. But he still had his gun.

“I’m glad to see you stayed put in your dinghy,” he said. “I kept an eye on you from the hill.” He handed down the plastic jugs to Sandy and added, “Sorry I acted so gruff, but you know how it is. I live all alone out here, and even though the island is only a little over a half mile from the mainland it’s a pretty isolated spot. I have to be careful of strangers. But I should have seen right away that you boys are all right.”

“Thanks,” said Sandy. “And thanks for filling our water jugs. We’re sorry we bothered you.”

They cast the dinghy free, rowed quickly back to the sloop and, as fast as they could manage it, raised the anchor, hoisted the sails and skimmed out of the cove. As they rounded the rocky point that marked the entrance to the cove, they looked back to where the island’s lone inhabitant was standing on the dock, watching them out of sight, his rifle still held ready at his hip.

“Boy, that’s a strange one!” Sandy said. “I wonder what he’s hiding on that island of his—a diamond mine?”

“You never can tell,” Jerry replied, “but it’s probably nothing at all. I guess the kind of man who would want to live all alone on an island away from people is bound to be pretty crazy about getting all the privacy he can. And as far as I’m concerned, he can have it. From now on, if we need anything, let’s head for the mainland!”

Dismissing the mysterious rifleman from their minds, they set out once more to enjoy the pleasures of a brisk wind, blue sky and a trim boat.

The afternoon went swiftly by as Sandy learned more and more about handling his boat, and about the boats they saw sailing near them. Jerry pointed out the different types of boats, explaining more fully than before that the ones with one mast were called sloops, the two-masted boats were called yawls, ketches and schooners. Telling one from the other was a matter of knowing the arrangement of masts. The ketches had tall mainmasts and shorter mizzens behind them. The yawls had even shorter mizzens, set as far aft as possible. Schooners, with taller mizzen than main, were relatively rare.

Jerry also pointed to varied types of one-masted boats. Not all of them, he told Sandy, were sloops, though most were. The sloops had their mast stepped about one third back from the bow. Cutters had their mast stepped nearly in the center of the boat. In addition, they saw a few catboats, with their single masts stepped nearly in the bows.

Learning all this, plus trying to absorb all that Jerry was telling him about harbor markers, sail handling, steering, types of sails and conditions under which each sail is used, Sandy found the time flying by. Almost before he realized it, the sun was beginning to set and the boats around them were all heading back up the channel to find their moorings and tie up for the night.