Lack of space has prevented the narration of more than a mere general outline of some of Edison's important achievements during part of the war years along chemical and engineering lines and in furnishing many of the industries of the country with greatly needed products that, for a time at least, were otherwise unobtainable. Much could be written about his work on producing myrbane, aniline salts, acetanilid, para-nitro-acetanilid, para-amido-phenol, benzidine, toluol, xylol, solvent naphtha, and naphthaline flakes--how his investigations and experiments on them ran along with the others, team fashion, so to speak, how he brought the same resourcefulness and energy to bear on many problems, and how he eventually surmounted numerous difficulties--but limitations of space forbid. Nor can we make more than a mere passing mention of the assistance he gave to the governments in the quick production of toluol and in furnishing plans and help to construct and operate two toluol plants in Canada. Suffice it to say that his achievements during this episode in his career were fully in accord with the notable successes he had already scored. It may be noted that in the three years following 1914 others went into the business of manufacturing the above chemicals, and as they installed and operated plants and furnished supplies needed in the industries Edison withdrew and shut down his special plants one after another. Let us now take a brief glance at the patriot-inventor at work for his government in war-times and especially during the last two years of the Great War. In the late summer of 1915 the Secretary of the Navy, Hon. Josephus Daniels, communicated to Mr. Edison an idea he had conceived of gathering together a body of men preeminent in inventive research to form an advisory board which should come to the aid of our country in an inventive and advisory capacity in relation to war measures. In this communication Secretary Daniels made an appeal to Edison's patriotism and asked him to devote some of his effort in the service of the country and also to act as chairman of the board. Although he was already working about eighteen hours a day, Edison signified his consent. In the fall of 1915 the board was organized and subsequently became known as the Naval Consulting Board of the United States. Mr. Edison was at first chairman and subsequently became president of the board. The history of the work and activities of the board is too extensive to be related here in detail and can only be hinted at. Indeed, it is the subject of a separate volume which is being published by the Navy Department. We shall, therefore, confine our narrative to the story of Edison's work.