Could Fulton have foreseen the development that his conception of submarine navigation would attain, it is well within the limit of probability that he would have preferred that publication of his plans be withheld until the basic principle had reached its present status of complete application. Though he lived more than eight years after writing his letter to Barlow, he made no effort to publish his plans, nor did he in any of his subsequent writings refer to his submarine idea nor what he had done in England. Apparently his sole thought of publishing was in the event of his being lost at sea on his return. If he could not carry his conception of submarine attack into actual execution, he apparently preferred that his plans be allowed to rest quietly in some English private library until the idea that he had espoused had taken actual practical form, and the principles that he advocated had been proved true. Absorbed at first on his return to America in the construction of his steamboat, perhaps he realized in the interval between 1806 and his death in 1815, that the world was not yet ready to receive the innovation of sub-surface navigation, that the state of the art of engine construction had not yet been advanced sufficiently to render the theory feasible and, consequently, that publication might have detracted from his fame as an engineer by apparently showing that he was a dreamer. Sometimes it is a misfortune to be ahead of the times. Better to wait until proved facts entitle one to be accorded praise as a man of vision, rather than through premature publication to be classed as a visionary man. Robert Fulton was born on the 14th November, 1765, on his father’s farm on Conowingo Creek in Little Britain Township, Pennsylvania. His father, Robert Fulton, Sr., was of Scottish descent. To his mother, Mary Smith, a woman of force and intelligence, young Robert owed his early education, and from her he derived the personal qualities that were to make him distinguished. His father was not successful as a farmer, so that when he died in 1768 he left his widow and five children in very straightened circumstances. Of the five children, three were girls, and of the boys, Robert was the elder. This story is not concerned with the history of the Fulton family which has been thoroughly set forth by others, except to recall those salient steps in Robert’s career that led to his investigation of the possibilities of submarine navigation, and the designing of a boat to accomplish the end so far as the then state of the art of boat and engine construction would permit.