THREE:While an impulse was thus given to the mathematical theory of light in the University of Cambridge, similar progress was being made in the sister University of Dublin, where three of her most eminent professorsSir William Rowan Hamilton, Dr. Lloyd, and Mr. M'Cullaghdevoted themselves energetically to its improvement and verification. Sir William Hamilton, a geometer of the first order, having undertaken a more complete discussion of the wave surface of Fresnel, to the equation of which he gave a more elegant form, ascertained the exact nature of that surface, and consequently the exact direction of refracted rays in the neighbourhood of the optic axes. The beautiful and unexpected results he obtained were verified by his friend Dr. Lloyd. The names of Sir William R. Hamilton and Dr. Lloyd will be handed down to posterity in connection with this discovery. "But," says Professor Forbes, "they have other claims to our respect. The former has generalised the most complicated cases of common geometrical optics, by a peculiar analysis developed in his essays on 'Systems of Rays.' To Dr. Lloyd we are indebted for several interesting experimental papers on optics, for an impartial review of the progress of the science, and for an excellent elementary treatise on the wave theory."
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THREE:On the Rhine, the war was carried on quite into the winter. The King of Prussia did not stay longer than to witness the surrender of Mayence; he then hurried away to look after his new Polish territory, and left the army under the command of the Duke of Brunswick. Brunswick, in concert with Wurmser and his Austrians, attacked and drove the French from their lines at Weissenburg, took from them Lauter, and laid siege to Landau. Wurmser then advanced into Alsace, which the Germans claimed as their old rightful territory, and invested Strasburg. But the Convention Commissioners, St. Just and Lebas, defended the place vigorously. They called forces from all quarters; they terrified the people into obedience by the guillotine, Lebas saying that with a little guillotine and plenty of terror he could do anything. But he did not neglect to send for the gallant young Hoche, and put him at the head of the army. Wurmser was compelled to fall back; Hoche marched through the defiles of the Vosges, and, taking Wurmser by surprise, defeated him, made many prisoners, and captured a great part of Wurmser's cannon. In conjunction with Pichegru, Dessaix, and Michaud, he made a desperate attack, on the 26th of December, on the Austrians in the fortified lines of Weissenburg, whence they had so lately driven the French; but the Duke of Brunswick came to their aid, and enabled the Austrians to retire in order. Hoche again took possession of Weissenburg; the Austrians retreated across the Rhine, and the Duke of Brunswick and his Prussians fell back on Mayence. Once there, dissatisfied with the Prussian officers, he resigned his command, he and Wurmser parting with much mutual recrimination. Wurmser was not able long to retain Mayence; and the French not only regained all their old positions, before they retired to winter quarters, but Hoche crossed the lines and wintered in the Palatinate, the scene of so many French devastations in past wars. The French also repulsed the enemy on the Spanish and Sardinian frontiers.
THREE:The Georges conspiracy, as it is commonly[498] called, was followed by a still more startling act of violence. As the Bourbons still continued to watch for the overthrow of his power, Buonaparte determined to take a deep revenge on the persons of any of that family whom he could by any means get into his hands. Could he have inveigled the Count d'Artois and the Duke of Berry, as he attempted, to leave London and land in Brittany, he would have seized them and put them to death without ceremony or mercy. But there was another member of the family, though the farthest off from succession to the throne, who was living on the French frontiers, within a tempting reach of his soldiers in Alsace, and him he determined to kidnap and kill. This proposed victim of a most lawless and wicked vengeance was Antoine-Henri de Bourbon, Duke d'Enghien, the son of the Prince of Cond. The project was so odious, so certain to cover both Napoleon and France with inextinguishable infamy, that it startled the not very sensitive mind of Talleyrand, who, it is said, gave the duke secret warning of his danger, and advised him to remove farther from the Rhine. In consequence, the duke applied to Sir Charles Stuart to get him a passport from the Austrian Minister, to enable him to cross the Austrian territory to rejoin his grandfather, then at Warsaw with Louis XVIII. Sir Charles Stuart applied to M. de Cobenzl for this purpose, and had the Austrian Court been quicker in its movements, the duke would have been safe enough from the myrmidons of Buonaparte; but, whilst lingering at Ettenheim in Baden for the necessary passport, the duke had so little suspicion of the prompt and deadly nature of the usurper's design against him, that he took no means to conceal himself, or he might still have escaped. But in the middle of the night of the 14th of March he was aroused by the sound of horses' hoofs, and, looking out, saw that the chateau was surrounded by a troop of French cavalry. Buonaparte had despatched his aide-de-camp, Caulaincourt, to Strasburg to effect this capture, and he had sent on Colonel Ordenner to bring the duke away from the heart of a neutral territory. The duke was summarily tried by a military tribunal and shot (March 21, 1804) at Vincennes. The news of this most audacious crime soon transpired, and filled Europe with horror and execration against its perpetrators.It was with this object that Mr. Pierce Mahony got up the celebrated "Leinster declaration," so called from the signature of Ireland's only duke. But the experiment served only to reveal the weakness of the moderate party, for after lying for signature in Latouche's Bank for two months, only forty-two names were attached to it within that period. When, however, the struggle between the two parties was on the point of having a bloody issue, the alarm spread through the ranks of moderate men on both sides, and the document rapidly received signatures. The declaration set forth that the disqualifying laws which affected Roman Catholics were productive of consequences prejudicial in the highest degree to the interests of Irelandthe primary cause of her povertythe source of political discontents and religious animositiesdestructive alike of social happiness and national prosperity. Unless the legislature should speedily apply a remedy to those evils, they must in their rapid progression assume such a character as would, perhaps, render their removal impossible. It was stated, therefore, to be a matter of paramount importance that the whole subject should be taken into immediate consideration by Parliament, "with a view to such a final conciliatory adjustment as may be conducive to the peace and strength of the United Kingdom, to the stability of our national institutions, and to the general satisfaction and concord of all classes of his Majesty's subjects."