“How thirsty I am!” he said to himself; and then he listened.

All was horribly silent, and he called in a startled way, to be answered by a faint “Ahoy!”

“This way, Billy!”

There was again silence as Mark threw himself wearily on a mass of ferns; but after a time the rustling of boughs and breaking of twigs could be heard, and at last from apparently a long way off came Billy’s voice again:

“Mr Mark, ahoy!”

“Ahoy! This way!”

Another pause, with the rustling of leaves and twigs continued, and Billy’s voice again:

“Ahoy, my lad! Where are you?”

“Here!”

There was a low muttering as if Billy were talking to himself, and then another shout.