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    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 "Mcanique Cleste," 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.
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    Colonel Campbell did not lose a single man, and had but three wounded, so that it is evident that the flight of the enemy must have been instantaneous and universal. Murat made no further attempt to seize Sicily, though he kept his camp on the heights behind Reggio and Scylla for two years longer.

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