TWO:In astronomy, Herschel discovered the planet Uranus in 1781; in 1802 he published, in the "Philosophical Transactions," his catalogue of five[199] hundred new nebul? and nebulous stars; and in 1803 announced his discovery of the motion of double stars round each other. In chemistry, Sir Humphry Davy, in 1807, extracted their metallic bases from the fixed alkalies; in 1808 demonstrated the same fact as it regarded the alkaline earths; in 1811 discovered the true nature of chlorine; in 1815 invented his safety lamp; and in 1817 (as already mentioned) brought it to perfection. In 1804 Leslie published discoveries of the nature and properties of heat; in 1808 Dalton announced his atomic theory; and in 1814 Wollaston completed its development and proof.
TWO:Windischgr?tz was, meanwhile, diligently preparing for the conquest of Hungary, with an army which numbered 65,000 men, with 260 guns. The full details of the campaign, however, can hardly be said to belong to English history. It is enough to say here that while G?rgei more than held him in check at the outset of the campaign, Bem, a Pole, had been conducting the war in the east of Hungary with the most brilliant success. He was there encountered by the Austrian General Puchner, who had been shut up in the town of Hermannstadt with 4,000 men and eighteen guns, and Bem succeeded in completely cutting off his communications with the main Austrian army. In these circumstances, the inhabitants of Hermannstadt and Kronstadt, on the Russian frontier, both menaced with destruction by the hourly increasing forces under Bem's command, earnestly implored the intervention of Russia. Puchner summoned a council of war, which concurred in the prayer for intervention. For this the Czar was prepared, and a formal requisition having been made by Puchner, General Luders, who had received instructions from St. Petersburg, ordered two detachments of his troops to cross the frontier, and occupy the two cities above mentioned. Nevertheless Bem defeated the combined Russian and Austrian army, and shortly afterwards G?rgei won an important battle at Isaszeg.








