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THREE:The Doctor took from his pocket some of the coin which was in circulation, and with which the boys had by this time become thoroughly familiar. They had remarked that it was as neatly made as any coin of Europe or America, and, as a matter of curiosity, they were desirous of seeing the machine by which each of the different pieces was stamped. The director kindly pointed out the various machines, and the boys observed that, with a single exception, they were all of Japanese make. Then they were shown through a factory for the manufacture of sulphuric acid that is attached to the mint, and is run on government account. They were somewhat astonished to learn that all the sulphuric acid used in the mint was made there, and that in the previous year thirteen thousand cases were exported to China. For the benefit of his professor of chemistry, Fred made the following memorandum concerning the branch of business he was investigating: