The boys began to wade up the rapid, and before they had reached the head of it Pepe yelled and jumped back from where he was wading at the bow. He took an oar and began to punch at something in the water, at the same time calling out.
"Crocodile!" cried George, and he climbed in the boat. Hal was not slow in following suit. Then Ken saw Pepe hitting a small crocodile, which lashed out with its tail and disappeared.
"Come out of there," called Ken to the boys. "We can't pull you up-stream."
"Say, I don't want to step on one of those ugly brutes," protested Hal.
"Look sharp, then. Come out."
Above the rapid extended a quarter-mile stretch where Pepe could row, and beyond that another long rapid. When the boys had waded up that it was only to come to another. It began to be hard work. But Ken kept the boys buckled down, and they made fair progress. They pulled up through eighteen rapids, and covered distance that Ken estimated to be about ten miles. The blue mountain loomed closer and higher, yet Ken began to have doubts of reaching Micas Falls that day.
Moreover, as they ascended the stream, the rapids grew rougher.
"It 'll be great coming down," panted Hal.
Finally they reached a rapid which had long dinned in Ken's ears. All the water in the river rushed down on the right-hand side through a channel scarcely twenty feet wide. It was deep and swift. With the aid of ropes, and by dint of much hard wading and pulling, the boys got the boat up. A little farther on was another bothersome rapid. At last they came to a succession of falls, steps in the river, that barred farther advance up-stream.
Here Ken climbed up on the bank, to find the country hilly and open, with patches of jungle and palm groves leading up to the mountains. Then he caught a glint of Micas Falls, and decided that it would be impossible to get there. He made what observations he could, and returned to camp.