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ONE: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.So prejudiced were the Allied Sovereigns against England, that they were ready to believe any tale to her disadvantage. One story which was circulated amongst them at the time was that Great Britain had bound herself to support Spain against France in return for certain stipulated commercial advantages. Another was that she had entered into a secret treaty to defend Portugal against France, even though Portugal should join Spain in the war. After all the Duke's arguments, explanations, and remonstrances, the French plenipotentiary was about to set off for Paris, representing all the Powers as being perfectly unanimous on the policy adopted towards Spain, and the Duke was obliged to threaten him with a public contradiction if he did not alter that statement and except Great Britain. TWO: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 year 1824 is memorable in Ireland for the establishment of the Catholic Association. The Catholic question had lain dormant since the union. Ireland remained in a state of political stupor. There was a Catholic committee, indeed, under the direction of a gentleman of property, Mr. John Keogh, of Mount Jerome, near Dublin. But his voice was feeble, and seldom heard. The councils of the Roman Catholics were much distracted. Many of the bishops, and most of the gentry, recommended prudence and patience as the best policy. Liberal statesmen in England were willing to make concessions, but the conscientious scruples of George III. had presented an insuperable barrier in the way of civil equality. There was an annual motion on the subject��first by Grattan, then by Plunket, and lastly by Burdett; but it attracted very little attention, till the formidable power of the Catholic Association excited general alarm for the stability of British institutions. Adverting to the past history of Ireland��her geographical position, her social state in respect of the tenure of property, and the numbers of the respective religious denominations of her people��the ablest Conservative statesmen considered that it would be extremely difficult to reconcile the perfect equality of civil privilege, or rather the bona fide practical application of that principle, with those objects on the inviolable maintenance of which the friends and opponents of Catholic Emancipation were completely agreed��namely, the Legislative union and the Established Church. There was the danger of abolishing tests which had been established for the express purpose of giving to the legislature a Protestant character��tests which had been established not upon vague constitutional theories, but after practical experience of the evils which had been inflicted and the dangers which had been incurred by the struggles for ascendency at periods not remote from the present. There was the danger that the removal of civil disabilities might materially alter the relations in which the Roman Catholics[249] stood to the State. Sir Robert Peel, in his "Memoirs," recites those difficulties at length, and in all their force. He fully admits that "the Protestant interest" had an especial claim upon his devotion and his faithful service, from the part which he had uniformly taken on the Catholic question, from the confidence reposed in him on that account, and from his position in Parliament as the representative of the University of Oxford.

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