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all stood still for a moment. The eerie noises gradually died away, and then they all became conscious of a strong smell of sulphur.

"What is that?" asked Betty, in an awed whisper. She was more impressed than she had been.

"Smells as if some one had lighted old-fashioned brimstone matches," answered Mr. Blackford.

"And it isn't the lightning, now," spoke Amy, looking at Mrs. Mackson. "It's the—ghost."

"A very material ghost, in my opinion," said the young man, who had so providentially come along. "I'm going to find out who it is."

He started toward the passage that led to the mansion.

"Don't you dare leave us here alone!" cried Betty, half tragically. Mr. Blackford looked at her a moment, and then added quietly:

"Well, perhaps it will be better to postpone the investigation. And there is your missing friend. But I would like to know who has an