self of the fact that the dust deposited on polished BY DR. ALFRED GRADENWITZ Many methods have been suggested to ascertain the upon volcanic rock. M. Folgheraiter found that in the black surfaces is easily seen. As neither polished volcanic regions a certain number of highly magnetic amount of… … John Fritz, of Bethlehem, Penn., on August 21, 1902, It is estimated that the annual consumption his eightieth birthday, to perpetuate the memory of his of coal in New York is fifteen and one-half achievements in industrial progress, million tons. T.
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