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It was before the days of Capern's discovery of the value of canadium and his use of it in the Capern filament, but the cerium and thorium alone were worth the money he extracted for the gas-mantles then in vogue. There were, however, doubts. Indeed, there were numerous doubts. What were the limits of the gas-mantle trade? How much thorium, not to speak of cerium, could they take at a maximum.
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