THREE:Accordingly, Charles could do nothing but maintain his position for the present in Scotland, and send off a messenger to France to announce his wonderful success, and to urge that now was the moment to hasten over troops and supplies, and secure the Crown and friendship of England for ever. He sent over Mr. Kelly to the French Court and to his father, and for a moment there was a lively disposition at Versailles to strike the blow. The king immediately despatched some supplies of money and arms, some of which were seized by English cruisers, and some of which arrived safely. There was also a talk of sending over Charles's brother, Henry, Duke of York, at the head of the Irish regiments and of others, and active preparations were made for the purpose at Dunkirk. But again this flash of enthusiasm died out, and Charles, three weeks after Kelly, sent over Sir James Stewart to aid him in his solicitations. But all was in vain. The French again seemed to weigh the peril of the expedition, and on their part complained that the Jacobites showed no zeal in England, without which the invasion would be madness. Thus the time went by, till the Dutch and English troops landed in England, and the opportunity was lost.Chemistry also received valuable extensions of its field. Dr. John Mayow published new facts respecting nitre, and on the phenomena of respiration and combustion, as revealed by experiments on this and other substances. At the commencement of the eighteenth century Stahl, a German chemist, propounded his theory of phlogiston as the principle of combustion, which was only exploded by the further discoveries of Dr. Black, Cavendish, and Priestley. Soon after, Dr. Hales threw new light on a?riform bodies, or, as they are now termed, gases; and finally, Dr. Black demonstrated the presence of a gas in magnesia, lime, and the alkalies, which had long before been noticed by Van Helmont, but had been forgotten. This was then termed fixed air, but has now acquired the name of carbonic acid gas, or carbon dioxide. At the end of this period chemistry was extensively studied, and was rapidly revealing its secrets.
