ON the 3rd of March of this year, M. Tisserand presented his report to the Council of the Observatory regarding the state of the Observatory during the past year. In his preliminary remarks he refers briefly to the work in course of execution. Under the direction of Le Verrier, great attention was concentrated on the meridian service, which comprises observations of the sun, moon, planets, asteroids, and the revision of the catalogue of Lalande. Extra-meridian observations of comets and small planets have been made with the equatorial in the west tower, and M. Wolf has been occupied in astro-physic researches. An important work in hand is that of publishing a catalogue of the Observatory, based on all the values of the meridian observations made from 1837-1881, while special researches on the R. A. of fundamental stars have been undertaken, and on the declinations, after methods proposed by M. Lœwy. The equatorial service has been enlarged by the addition of another coudé, which instrument is devoted to the observation of planets, comets, systematic measures of double stars and nebulæ, and will be occupied in future with the study of the most interesting variable stars.