THREE:In the galaxy of illustrious names that shed light upon this age, not the least conspicuous is that of Mary Somerville, who is known in British[431] science not only as the able commentator of Laplace's "M��canique C��leste," but as the author of some ingenious experiments on the magnetising power of the violet ray, and on the permeability of different bodies to the chemical rays, similar to those of Melloni on the heating rays; and she found great and seemingly capricious variations in this respect. The beautiful invention of the stereoscope, one of the most interesting contributions made to the theory of vision, was the work of Mr. Wheatstone, who published an account of it in the "Philosophical Transactions" of 1838. In connection with experiments of this class should be mentioned the invention of the daguerreotype, or the production of permanent pictures on plated copper, in 1825, which was brought to perfection in 1839 by Daguerre, whose name it bears. About the same time Henry Fox Talbot applied himself to similar experiments, and invented the calotype, or the production of permanent pictures on paper; and by a subsequent invention he obtained what he justly called "an instantaneous process." The science of photography was, however, in its infancy.The way having been thus prepared, Mr. O'Connell proceeded to the scene of the contest. On the day of his departure his carriage, with four horses, drove into the yard of the Four Courts, where he had been engaged on an important trial. Having concluded his address to the judges, he put off his wig and gown, and proceeded through the hall, where he was followed by the lawyers and the persons from the different courts, so that the judges were deserted. Stepping into his open barouche, accompanied by Mr. P. O'Gorman, secretary of the Association, Mr. R. Scott, solicitor, and Father Murphy, the celebrated parish priest of Corrofin, he drove off amidst the cheers of all present. The greatest possible excitement prevailed along the whole route, and he enjoyed an ovation at every town he passed through. At Ennis, though he entered the town by daybreak, the traders and the inhabitants turned out in procession to meet him. Priests swarmed in all the streets, and in every face there was an unconcealed expression of joyous and exulting triumph.