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THREE:"The sulphur comes from the provinces of Satsuma and Bungo��the most from the latter, and the best from the former; and the product is partly for the use of the mint, and partly for general commerce. The acid is packed in earthen jars which are glazed on the inside, and not in the carboys that are in use with us. Two jars, holding about eight quarts each, are packed in a wooden case; they rest on a bed of lime about three inches thick, and the remainder of the space is filled with coarse ashes and coal cinders. This manner of packing is considered preferable to the old one, and, besides, it enables the Japanese to make their own jars, instead of importing the carboys. The director tells me that thus far the factory has not been able to supply the Chinese demand for acid, and therefore no shipments have been made to other countries. With an increased production, it is quite possible that shipments may be made to America at no very distant day.As the boys rode along, their attention was drawn to some tall ladders that rose above the buildings, and they eagerly asked the Doctor what those ladders were for. They could not see the use of climbing up in the air and then coming down again; and, altogether, the things were a mystery to them. A few words explained the matter. The ladders were nothing more nor less than fire-lookouts, and were elevated above the buildings so that the watchmen could have an unobstructed view. A bell was attached to each ladder, and by means of it a warning-signal was given in case of a threatened conflagration. Fires are frequent in Tokio, and some of them have done immense damage. The city is mostly built of wood; and when a fire breaks out and a high wind is blowing, the result is often disastrous to an enormous extent.