The very cries of warning, indeed, of those above brought about the result they sought to prevent; for, looking up and waving his hand to reassure them, Bob all at once lost his footing, rolling over and plunging into the water right on top of Rover, his yell of dismay being echoed by a howl of pain from the dog. CHAPTER FOUR. DICK TO THE RESCUE. "Gracious heavens! The boy will be drowned!" exclaimed Mrs Gilmour, wringing her hands frantically and rushing forward at once; while Nellie, equally excited, burst into tears, clinging to her aunt's side. "Oh, what shall I say to his mother? He's lost; he's lost!" "No, he isn't--not a bit of it; no more drowned than I am," cried the Captain, laying his hand on Mrs Gilmour's arm, and putting both her and Nellie back, to prevent any rash impulse on their part. "You just keep as cool as the young rascal must be now! I'll fish him out in another minute, if you'll leave me alone; and, he'll be none the worse, barring a wetting." With these words, the spry old gentleman, who was more active than many a younger man, began making his way cautiously down the treacherous slope of the rampart, aided by his trusty malacca cane, poking his stick between the niches of the stonework to act as a stay, and so prevent his slipping on too fast. But, quick as he was in his movements, hardly had he made a dozen sliding steps down the decline, the action of the whole scene being almost instantaneous, when he felt, rather than saw, some one else glide swiftly past him still more expeditiously; and then, there was another heavy plunge in the water below, where Bob and Rover were struggling for dear life. "Bless my soul!" ejaculated the Captain, halting abruptly with the assistance of his sheet anchor, the malacca cane, as he half turned round. "The woman's never such a fool!" He thought it was Mrs Gilmour. But, he was mistaken. Dick had anticipated them both. Bob's unlucky slip and cry of alarm as he fell into the sea, his aunt's exclamation of terror, the Captain's movement to the rescue, and the grateful Dick's perilous jump, for it was almost a leap from the top of the castle wall, were all, as has been already pointed out, the work of a moment; the chain of incidents taking much longer to describe than to happen. So, there, before you could cry `Jack Robinson,' as the Captain afterwards said, two boys, instead of one, were struggling with the dog in the water; and of all these three, to heighten the excitement of the scene, Rover alone was able to swim! Bob, of course, had plunged in unwittingly, while Dick's only thought was to help one from whom he had received such unexpected kindness; the lad not having reflected for an instant on the danger of the task he was undertaking. Now, therefore, although on reaching the water the grateful boy succeeded in carrying out his object of catching hold of Bob, both immediately sank under the surface.