There were many speculations in early times as to the application of steam-power for propelling vessels through the water. David Ramsay in 1618, Dr. Grant in 1632, the Marquis of Worcester in 1661, were among the first in England to publish their views upon the subject. But it is probable that Denis Papin, the banished Hugnenot physician, for some time Curator of the Royal Society, was the first who made a model steam-boat. Daring his residence in England, he was elected Professor of Mathematics in the University of Marburg. It was while at that city that he constructed, in 1707, a small steam-engine, which he fitted in a boat--une petite machine d'un, vaisseau a roues--and despatched it to England for the purpose of being tried upon the Thames. The little vessel never reached England. At Munden, the boatmen on the River Weser, thinking that, if successful, it would destroy their occupation, seized the boat, with its machine, and barbarously destroyed it. Papin did not repeat his experiment, and died a few years later. The next inventor was Jonathan Hulls, of Campden, in Gloucestershire. He patented a steamboat in 1736, and worked the paddle-wheel placed at the stern of the vessel by means of a Newcomen engine. He tried his boat on the River Avon, at Evesham, but it did not succeed, and the engine was taken on shore again. A local poet commemorated his failure in the following lines, which were remembered long after his steamboat experiment had been forgotten:-- "Jonathan Hull, With his paper skull, Tried hard to make a machine That should go against wind and tide; But he, like an ass, Couldn't bring it to pass, So at last was ashamed to be seen." Nothing of importance was done in the direction of a steam-engine able to drive paddles, until the invention by James Watt, in 1769, of his double-acting engine--the first step by which steam was rendered capable of being successfully used to impel a vessel. But Watt was indifferent to taking up the subject of steam navigation, as well as of steam locomotion. He refused many invitations to make steam-engines for the propulsion of ships, preferring to confine himself to his "regular established trade and manufacture," that of making condensing steam-engines, which had become of great importance towards the close of his life. Two records exist of paddle-wheel steamboats having been early tried in France--one by the Comte d'Auxiron and M. Perrier in 1774, the other by the Comte de Jouffroy in 1783--but the notices of their experiments are very vague, and rest on somewhat doubtful authority.