JACQUES DOMINIQUE CASSINI, Count son of Cesar Francois Cassini, was born at the observatory of Paris on June 3o, 1748. He succeeded in 1784 to the directorate of the observatory ; but his plans for its restoration and re-equipment were wrecked in 1793 by the French Revolution. He spent some months in prison in 1794, and then withdrew to Thury, where he died on Oct. 18, 1845. He completed his father's map of France, which was published by the Academy of Sciences in 1793. It served as the basis for the Atlas National (1791), showing France in departments. Count Cassini's Memoires pour servir a l'histoire de l'observatoire de Paris (1810) included the autobiography of his great-grandfather, the first Cassini.
See J. F. S. Devic, Histoire de la vie et des travaux de J. D. Cassini (1851) ; J. Delambre, Histoire de l'astronomie au XVIIIe siecle; C. Wolf, Histoire de l'observatoire de Paris (1902).