Paris, France

National Observatory. Long. from Green wich Oh. 9m. 20.95s. E., lat. 48° 50′ 11.87" N. Directors: J. D. Ca ini 1671, J. Ca ini 1712, C. F. Ca ini 1756, J. D. Ca ini 1784, J. J. L. De La Lande 1795. P. Me chain 1801, A. Bouvard 1804, F. J. D. Arago 1830, U. J. J. Le Verrier 1853, C. E. Delaunay 1871, U. J. J. Le Verrier 1872, E. Mouchez 1878, F. F. Ti erand 1892-96. Founded 1667; a huge building, commenced by the architect Perrault, but poorly adapted to the requirements of a modern observatory: the principal instruments are mounted in other structures. These comprise a reflecting telescope of 4 ft. aperture, a refractor of 29 in., a number of smaller refractors, and a meridian circle by Secret an & Eichens, 9.5 in. aperture.