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While Papin had neglected his earlier suggestion of a steam and piston engine to work on Savery's ideas, Thomas Newcomen, with his assistant, John Cawley, put into practical form Papin's suggestion of 1690. Steam admitted from the boiler to a cylinder raised a piston by its expansion, assisted by a counter-weight on the other end of a beam actuated by the piston. The steam valve was then shut and the steam condensed by a jet of cold water. The piston was then forced downward by atmospheric pressure and did work on the pump. The condensed water in the cylinder was expelled through an escapement valve by the next entry of steam. This engine used steam having pressure but little, if any, above that of the atmosphere.

Hiero, so long the faithful ally of Rome, died shortly after the battle of Cannae (B.C. 216), and was succeeded by his grandson Hieronymus, a vain youth, who abandoned the alliance of Rome for that of Carthage. But he was assassinated after a reign of fifteen months, and a republican form of government was established in Syracuse. A contest ensued between the Roman and Carthaginian parties in Syracuse, but the former ultimately prevailed, and Epicydes and Hippocrates, two brothers whom Hannibal had sent to Syracuse to espouse his interests, had to quit the city, and took refuge at Leontini. Such was the state of affairs when the Consul Marcellus arrived in Sicily (B.C. 214). He forthwith marched against Leontini, which Epicydes and Hippocrates defended with a considerable force. He took the city by storm, and, though he spared the inhabitants, executed in cold blood 2000 Roman deserters whom he found among the troops that had formed the garrison. This sanguinary act at once alienated the minds of the Sicilians, and alarmed the mercenary troops in the service of Syracuse. The latter immediately joined Hippocrates and Epicydes, who had made their escape to Herbessus; the gates of Syracuse were opened to them by their partisans within the walls, and the party hostile to Rome was thus established in the undisputed command of that city.

Once started in the launch _Rimac_, we went through interesting channels, outlets of the main stream being often noticeable on either bank, cutting wide passages through the forest and forming one or more shallow lakelets, with innumerable aquatic plants on the surface of the water. As we went farther it became easy to understand how islands were constantly forming in the river. Quantities of large and small logs of wood were continually floating down the stream; the banks were gradually being eaten away by the current. Whole trees fell down with their immense branches and polypi-like roots, and formed a barrier arresting the progress of the floating wood. Particles of earth deposited by wind and by water saturated with impurities settled there. Soon grass would begin to grow on those deposits, which quickly collected more deposits of flying and floating particles. The soft bottom of the river, disturbed by the deviated current, piled up mud against the submerged branches resting on the river-bed. Quickly an island was then formed; more wood accumulated, more grass, more mud; the base of the islands would increase rapidly, and in the space of a few years islands several kilometres in length rose above the water.

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