"It was a mistake; he was trying experiments too," Grizzel explained. "But, please, may I go and tell him that he isn't a murderer? He is expecting to be hanged every minute, and it makes him feel perfectly miserable. But I was sure that my ring would bring him luck." Grizzel sped off on her mission. She knocked at the dark-room door. "Please put an ear at the keyhole--I have important news." An ear was promptly at her disposal. She did not ask whose, but went on: "The murdered man has come, and he isn't in the least dead. And his blood wasn't blood, only his experiment, and he's got my ring. He is a nice man, and he is forgiving Hugh as hard as he can, and there were two miracles, and I told you so!" There was a momentary silence within, and then a glad shout. Dick began to sing "God save the King", which seemed less appropriate when he remembered that the sovereign of the moment was a queen; but no one noticed, and the main point was that someone was saved. A few minutes later the dark-room party emerged, Hugh very pale and shaky as he went to meet his supposed victim. Indeed, for a moment he was incapable of speech, and Jerry, who knew only too well what it felt like to have a lump sticking in his throat just when he wanted to be most manly and soldier-like, filled up what would have been an awkward pause by saying anything that came into his head until Hugh had recovered himself. "I've had a lesson," he began, as he shook hands with the young man, whose name they now learnt was Desmond O'Rourke. "I am awfully sorry--" "That's all right," Mr. O'Rourke interrupted, "we all have to learn lessons now and then--I've learnt some myself--at least I hope I have. How are the photographs turning out?" "Very well, thank you. Would you like to come and see them? Mr. Ferguson's is the best portrait I have done yet." Hugh recovered from his emotion as he spoke, but he was still very pale. Mr. O'Rourke accepted the invitation with alacrity. "We can exchange experiences," he said. "I am curious to know what the experiment was that so nearly bowled me out. But first I must return the diamond to its owner." He drew the ring out of an inner pocket and held it out to Grizzel. As the diamond met the golden glow of the fading day its green rays gleamed and sparkled. "One might believe it was alive!" Mr. O'Rourke exclaimed. "I never saw anything like it. You kids ought not to have a jewel like that to play pitch-and-toss with; someone should keep it for you." "I wear it round my neck," said Grizzel, unfastening the neckband of her overall and showing a slender chain of finely wrought gold. She took it off and slung the ring on. "I have one almost as good," Hugh observed, as they watched Grizzel, "but mine is not set yet; perhaps I'll have it made into a ring some day. Mamma says I should keep it till I want an engagement ring--" "O bay o' Dublin, my heart you're troublin',"