The gorilla did not like such treatment, and with a snarl it dropped its hold on the captain and turned towards Dave. A moment later it was on the young diver's breast and Dave was doing his utmost to throw the creature off. It was now the young diver's turn to call for assistance, which he did most lustily. "I'll help you!" cried the captain, and catching up a stone, he hit the gorilla in the side with it. The creature gave a snarl and sprang back to the top of the rocks. Then it disappeared as suddenly as it had come. "Ugh!" murmured Dave. "What a horrid beast!" "Are you hurt?" "Only a scratch or two." "We were lucky to get off so easily, lad." "Is he gone for good?" asked Dave, with a slight shiver. "I'm sure I don't know." Each now lost no time in arming himself with a stout club and with a couple of fair-sized and sharp stones. They listened, but could hear nothing of the gorilla. "I'd feel safer if I knew that beast was dead," said the captain. "He may take it into his head to attack us again." "And he may be only one of a regular tribe," put in Dave. "No, Dave; gorillas don't live together like monkeys. At the most you'll find two together." With great caution they climbed to the top of the rocks and peered over. Not a living creature of any sort was in sight. "He has gone, that's certain," said Dave, and gave a sigh of relief. They went on their way, and inside of an hour had walked completely around the island, which was not over half a mile in diameter. "Now we'll go up the hill and take a look around," said Captain Broadbeam. On the side of the hill the tropical growth was thick, and they had to fairly cut their way through the tangle of underbrush and long trailing vines. "This is what I call work," said Dave, panting. "How much further have we to go?" "Not very much further, Dave. I think--listen!" The captain broke off short and both listened. But only the murmur of the breeze through the trees came to their ears. "What did you hear?" asked the young diver. "I fancied I heard that gorilla again." "Oh, don't say that!" "Perhaps I was mistaken. But it would be just like the beast to follow us," continued the master of the _Swallow_. "We will have to be on our guard." Both looked around with care, but could see nothing of the gorilla. Then they pushed on once more, up the rocks and through a tangle of vines until they reached a bit of a clearing on the very top of the hill. "Here we are, safe and sound!" said the captain. "I wish we had a spyglass." They took a careful look around, and noted that the island was circular in form, with a small cove on the south shore, where the rowboat had landed. On all sides stretched the rolling Pacific, the waves glistening brightly in the strong sunshine. Not another island of any sort was in sight. "I believe that other island is to the westward of this," said the captain. "But it's too far off to be located with the naked eye."