In the latter capacity it was part of his duty to prepare _éloges_ of deceased Academicians. Of his collected works in fourteen volumes, 'Oeuvres de François Arago,' published in Paris, 1865, three volumes are given to these 'Notices Biographiques.' Here may be found the biographies of Bailly, Sir William Herschel, Laplace, Joseph Fourier, Carnot, Malus, Fresnel, Thomas Young, and James Watt; which, translated rather carelessly into English, have been published under the title 'Biographies of Distinguished Men,' and can be found in the larger libraries. The collected works contain biographies also of Ampère, Condoreet, Volta, Monge, Porson, Gay-Lussac, besides shorter sketches. They are masterpieces of style and of clear scientific exposition, and full of generous appreciation of others' work. They present in a lucid and popular form the achievements of scientific men whose works have changed the accepted opinion of the world, and they give general views not found in the original writings themselves. Scientific men are usually too much engrossed in advancing science to spare time for expounding it to popular audiences. The talent for such exposition is itself a special one. Arago possessed it to the full, and his own original contributions to astronomy and physics enabled him to speak as an expert, not merely as an expositor. The extracts are from his admirable estimate of Laplace, which he prepared in connection with the proposal, before him and other members of a State Committee, to publish a new and authoritative edition of the great astronomer's works. The translation is mainly that of the 'Biographies of Distinguished Men' cited above, and much of the felicity of style is necessarily lost in translation; but the substance of solid and lucid exposition from a master's hand remains. Arago was a Deputy in 1830, and Minister of War in the Provisional Government of 1848. He died full of honors, October 2d, 1853. Two of his brothers, Jacques and Étienne, were dramatic authors of note. Another, Jean, was a distinguished general in the service of Mexico. One of his sons, Alfred, is favorably known as a painter; another, Emmanuel, as a lawyer, deputy, and diplomat. [Illustration: Signature: Edward S. Holden] LAPLACE