They shouted, from time to time, until they were hoarse and weary; but no one heard them, and at last they ceased.  Nick was growing very weary. Once he slipped off, half asleep, and ’Possum had to swim after him and bring him back to the boat. He seemed half-dazed, and a sick fear came over her that the heat of the sun on his bare head had been too much for him.  She splashed water over his face, and he became more alive.