They showed her the turf tracks on either side as they bowled along Belvidere avenue eastward, and they were still engaged in explaining to her the methods of horse racing when Tom started down the long hill beside the Tyson place, Cylburn, leading down to the bridge across Jones' Falls. The girl was asking questions, with her bewitching face in close proximity to Edwin's, when there came a startling interruption to their fun. Tom, again greatly interested in the talk, failed to notice a large boulder in the road, and the auto shot over it with a jolt that caused him to lose control of the wheel. The big machine regained its balance, but not its course. Instead, it careened to the right and bumped into the ditch before the alarmed occupants had scarcely grasped their peril. Tom was tossed out on the roadway. Edwin was pitched into the front seat, the mermaid shot past him and fell on a clump of green turf and the tub of water upset, and, in seeking an outlet, poured over the car, drenching Edwin.
"Look out for a gasoline explosion!" shrieked Tom, raising himself from the road, apparently unhurt. Edwin knew he could do nothing to prevent such a catastrophe, so he followed the other two out of the auto as quickly as he could. For a moment he and Tom paid no attention to the mermaid, so absorbed were they in the possibility of a blow-up. But when this danger had apparently passed they discovered that she had lifted herself from the grassy sward and was flip-flopping awkwardly in the direction of the brook that runs through Cylburn near the road.
"Come back! Come back! There's no danger!" called Edwin, as he started after her.
The damsel paid no heed. She was intent on getting to that stream of running water.
Again Edwin called, this time more sharply. The mermaid stopped not, but turned a tearful and much convulsed face to him.
Edwin raced after her. So did Tom. But when they got to the edge of the brook the only sign of her was an increasing ripple on the surface of a little pool. The stream was not so deep but that the bottom could be studied. And yet they saw nothing of her. Evidently she had the enchanted gift of being invisible in water.
Tom looked at Edwin. Edwin looked at Tom.
"That beats the Dutch!" said Tom.
"It's worse than that," replied Edwin, an odd catch in his voice. "We certainly have queered her for good. We must find her and get her back to the Park somehow."
For hours they moved up and down alongside the stream, calling pleadingly, but without response, for their quondam friend. Edwin made a little oration to her in absentia, in which he humbly begged her pardon and swore by all the gods of Mount Olympus—by the great Jupiter, the chaste Diana and all the rest of them, as far as he could remember their names—that he would restore her safely to the lake. But she came not. Tom added his entreaties, but she heeded not. Then Tom suggested that perhaps she had worked her way down the brook and into Jones' Falls, whence she could, if she but knew the pipes, get into her beloved lake again. Edwin jumped at the idea, and, leaving Tom to look after the auto, hastened down the ravine to Jones' Falls, and moved up and down the Falls, calling for the vanished damsel with a fervor that might have caused doubts as to his sanity had anyone heard it.