Fulton had advanced with almost meticulous caution. He had first collected together all the details that could be got about contemporary experiments; he had sifted the theories of others and made use of the residue. He had often talked with Rumsey while in England, and he had even accompanied Henry Bell to call on Symington, seen a trial trip of the _Charlotte Dundas_, and incidentally obtained some valuable information. Finally, after seeing what was good and what was bad he had proceeded independently, and, after a stroke of ill-luck, succeeded. He had knowledge of what others had attempted in America, in England and in France, and emphatically he was not the kind of man to deny his indebtedness to what others had done before him. The ship which he evolved was certainly in shape, proportions and general appearance not unlike the model of that earlier craft whose exploits on the Saône we considered on another page. The Marquis de Jouffroy had sent this model to Paris as far back as 1783, the year of his successful enterprise at Lyons, or twenty years before Fulton made his achievement, and it is most improbable that Fulton, who endeavoured to see everything which bore on his pet subject, living several years in Paris, should not have carefully studied this. Furthermore, Fulton’s boat was constructed in the workshop and under the very eyes of that Périer who had been associated with the Marquis in navigating the Seine by steamboat, and from this same Périer, as already stated, the engine was borrowed for Fulton’s boat. Fulton also personally considered the patent which Desblanc, forestalling Jouffroy, had obtained, and the American had described his impressions of Desblanc’s idea in no praiseworthy terms, for he saw that at least two-thirds of the latter’s steam power would be lost. Fulton worked his plans out to the minutest details: Desblanc had left his theory too scantily clothed with facts. He had not found the proportion which his paddles should bear to the bow of his boat, nor the velocity at which they should run in proportion to the velocity at which the boat was intended to go. Very scathing is the American’s denunciation of this haphazard method. “For this invention to be rendered useful,” wrote Fulton, “does not consist in putting oars, paddles, wheels or resisting chains in motion by a steam engine--but it consists in showing in a clear and distinct manner that it is desired to drive a boat precisely any given number of miles an hour--what must be the size of the cylinder and velocity of the piston? All these things being governed by the laws of Nature, the real Invention is to find them.”