Let us now consider Edison's work on paraphenylenediamine. This is a chemical product which is largely used in dyeing furs black. America had imported all her requirements from Germany, but within a few months after the beginning of hostilities the visible supply was exhausted and no more could be expected during war-times. Fur-dyers were in despair. This product being also absolutely essential in the manufacture of phonograph records, Edison worked out a process for making it, and as his requirements were very moderate he established a small manufacturing plant at the Orange laboratory and soon began to produce about twenty-five pounds a day. In some way the news reached the ears of many desperate fur-dyers, and Edison was quickly besieged with most urgent requests for such portion of his output as could be spared. Fortunately, a small proportion of the output was available and was distributed daily in accordance with the necessities of those concerned. This small quantity being merely a drop in the bucket, the fur-dyers earnestly besought Edison to establish a larger plant and supply them with greater quantities of paraphenylenediamine, as their business had come almost to a standstill for lack of it. He, therefore, designed and constructed rapidly a larger plant, which, when put into operation, was soon producing two hundred to three hundred pounds a day, thus saving the situation for the fur-dyers. The capacity of this plant was gradualy increased until it turned out upward of a thousand pounds a day, of which a goodly proportion was exported to Europe and Japan.