Fulton was, during all these experiments, much pressed for money, and apparently was making no headway toward the use of his submarine engines in a profitable way. It was in despair of getting our Government to make an investment in this direction that he finally turned to the problem of navigation by steam. He had the valuable co-operation in his new work of Chancellor Livingston, of New Jersey, who, while devoting much of his own time and means to the advancement of science, was fond of fostering the discoveries of others. He had very clear conceptions of what would be the great advantages of steamboats on the navigable rivers of the United States. He had already, when in Paris, applied himself at great expense to constructing vessels and machinery for that kind of navigation. As early as 1798 he believed that he had accomplished his object, and represented to the Legislature of New York that he was possessed of a mode of applying the steam-engine to a boat on new and advantageous principles; but that he was deterred from carrying it into effect by the uncertainty of expensive experiments, unless he could be assured of an exclusive advantage should it be successful. The Legislature in March, 1798, passed an act vesting him with the exclusive right and privilege of navigating all kinds of boats which might be propelled by the force of fire or steam on all the waters within the territory of New York for the term of twenty years, upon condition that he should within a twelve-month build such a boat, whose progress should not be less than four miles an hour. [Illustration: John Fitch's Steamboat at Philadelphia.] Livingston, as soon as the act had passed, built a boat of about thirty tons burden, to be propelled by steam. Soon after he entered into a contract with Fulton, by which it was agreed that a patent should be taken out in the United States in Fulton's name. Thus began the preparations for the first practical steamboat. All the experiments were paid for by Chancellor Livingston, but the work was Fulton's. In 1802, in Paris, he began a course of calculations upon the resistance of water, upon the most advantageous form of the body to be moved, and upon the different means of propelling vessels which had been previously attempted. After a variety of calculations he rejected the proposed plan of using paddles or oars, such as those already used by Fitch; likewise that of ducks' feet, which open as they are pushed out and shut as they are drawn in; also that of forcing water out of the stern of the vessel. He retained two methods as worthy of experiment, namely, endless chains with paddle-boards upon them, and the paddle-wheel. The latter was found to be the most promising, and was finally adopted after a number of trials with models on a little river which runs through the village of Plombières, to which he had retired in the spring of 1802, to pursue his experiments without interruption.