“Play it’s night,” suggested Richard. He had put on a pair of goggles and was making a great pretence of getting ready to start. Georgina, leaning out as Rosalind had done, waved her lily hand in frantic beckonings for her rescuers to follow faster. The motor chugged harder and harder. The car shook violently.

To the vivid imaginations of the passengers, the chase was as exciting as if the automobile were really plunging down the road instead of throbbing steadily in one spot in the dim garage. The gas rolling up from somewhere in the back made it wonderfully realistic. But out on the open road the smell of burning gasoline would not have been so overpowering. Inside the little box-like garage it began to close in on them and settle down like a dense fog.

Georgina coughed and Richard looked back apprehensively, feeling that something was wrong, and if that queer smoke didn’t stop pouring out in such a thick cloud he’d have to shut off the engine or do something. Another moment passed and he leaned forward, fumbling for the key, but he couldn’t find it. He had grown queerly confused and light-headed. He couldn’t make his fingers move where he wanted them to go.

He looked back at Georgina. She wasn’t waving her hands any more. She was lying limply back on the seat as if too tired to play any longer. And a thousand miles away--at least it sounded that far--above the terrific noise the motor was making, he heard Captain Kidd barking. They were short, excited barks, so thin and queer, almost as thin and queer as if he were barking with the voice of a mosquito instead of his own.

And then--Richard heard nothing more, not even the noise of the motor. His hand dropped from the wheel, and he began slipping down, down from the seat to the floor of the car, white and limp, overcome like Georgina, by the fumes of the poisonous gas rolling up from the carburetor.

Mr. Milford, up in the hammock, had been vaguely conscious for several minutes of unusual sounds somewhere in the neighborhood, but it was not until he reached the end of the chapter that he took any intelligent notice. Then he looked up thinking somebody’s machine was making a terrible fuss somewhere near. But it wasn’t that sound which made him sit up in the hammock. It was Captain Kidd’s frantic barking and yelping and whining as if something terrible was happening to him.

Standing up to stretch himself, then walking to the corner of the porch, Mr. Milford looked out. He could see the little terrier alternately scratching on the garage door and making frantic efforts to dig under it. Evidently he felt left out and was trying desperately to join his little playmates, or else he felt that something was wrong inside.

Then it came to Mr. Milford in a flash that something was wrong inside. Nobody ever touched that machine but himself and the chauffeur, and the chauffeur, who was having a day off, was half-way to Yarmouth by this time. He didn’t wait to go down by the steps. With one leap he was over the railing, crashing through the vines, and running down the terrace to the garage.

As he rolled back one of the sliding doors a suffocating burst of gas rushed into his face. He pushed both doors open wide, and with a hand over his mouth and nose hurried through the heavily-charged atmosphere to shut off the motor. The fresh air rushing in, began clearing away the fumes, and he seized Georgina and carried her out, thinking she would be revived by the time he was back with Richard. But neither child stirred from the grass where he stretched them out.

As he called for the cook and the housekeeper, there flashed into his mind an account he had read recently in a New York paper, of a man and his wife who had been asphyxiated in just such a way as this. Now thoroughly alarmed, he sent the cook running down the Green Stairs to summon Richard’s father from the studio, and the housekeeper to telephone in various directions. Three doctors were there in a miraculously short time, but despite all they could do at the end of half an hour both little figures still lay white and motionless.