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"Whew!" gasped Ned, as he stood beside Tom in the bow of the airship. "What's that choking us, Tom?"
"Sulphur, I guess, and gases from the volcano. The wind blew 'em over this way. They're not dangerous, as long as there is no carbonic acid gas given off, and I don't smell any of that, yet. Say, Ned, it's erupting all right, isn't it?"
"I sho