Rob may have read of these things in fairy tales and books of travel, but if so they had entirely slipped his mind; so he slumbered peacefully and actually snored a little, I believe, towards morning.
But even as the red sun peeped curiously over the horizon he was awakened by a most unusual disturbance—a succession of hoarse screams and a pounding of the air as from the quickly revolving blades of some huge windmill.
He rubbed his eyes and looked around.
Coming towards him at his right hand was an immense bird, whose body seemed almost as big as that of a horse. Its wide-open, curving beak was set with rows of pointed teeth, and the talons held against its breast and turned threateningly outward were more powerful and dreadful than a tiger's claws.
While, fascinated and horrified, he watched the approach of this feathered monster, a scream sounded just behind him and the next instant the stroke of a mighty wing sent him whirling over and over through the air.
He soon came to a stop, however, and saw that another of the monsters had come upon him from the rear and was now, with its mate, circling closely around him, while both uttered continuously their hoarse, savage cries.
Rob wondered why the Garment of Repulsion had not protected him from the blow of the bird's wing; but, as a matter of fact, it had protected him. For it was not the wing itself but the force of the eddying currents of air that had sent him whirling away from the monster. With the indicator at zero the magnetic currents and the opposing powers of attraction and repulsion were so evenly balanced that any violent atmospheric disturbance affected him in the same way that thistledown is affected by a summer breeze. He had noticed something of this before, but whenever a strong wind was blowing he was accustomed to rise to a position above the air currents. This was the first time he had slept with the indicator at zero.
The huge birds at once renewed their attack, but Rob had now recovered his wits sufficiently to draw the electric tube from his pocket. The first one to dart towards him received the powerful electric current direct from the tube, and fell stunned and fluttering to the surface of the sea, where it floated motionless. Its mate, perhaps warned by this sudden disaster, renewed its circling flight, moving so swiftly that Rob could scarcely follow it, and drawing nearer and nearer every moment to its intended victim. The boy could not turn in the air very quickly, and he feared an attack in the back, mistrusting the saving power of the Garment of Repulsion under such circumstances; so in desperation he pressed his finger upon the button of the tube and whirled the instrument around his head in the opposite direction to that in which the monster was circling. Presently the current and the bird met, and with one last scream the creature tumbled downwards to join its fellow upon the waves, where they lay like two floating islands.
Their presence had left a rank, sickening stench in the surrounding atmosphere, so Rob made haste to resume his journey and was soon moving rapidly eastward.
He could not control a shudder at the recollection of his recent combat, and realized the horror of a meeting with such creatures by one who had no protection from their sharp beaks and talons.