DUPERREY, Louis Isidore (1786-1865), a French navigator and scientific investigator, was born at Paris, entered the navy in 1803, took part in the military operations of 1809 at Brest and Rochefort, and assisted in the hydrographical survey of the coast of Tuscany carried on during that and the following year. From 1817 to 1820 he served under Freycinet in his great voyage round the world, being intrusted with the hydrographic operations on board the “Urania;” and he contributed largely to the preservation of the crew and the scientific collections when his vessel was wrecked at the Malouin Islands. In 1822 he attained the rank of lieutenant, and was intrusted with the command of the “Coquille,” which during the next three years was engaged in scientific explorations in the South Pacific and along the coasts of South America. From this voyage he brought back not only great additions to cartography and important data in regard to the currents of the Pacific, but also numerous pendulum observations, serving to determine the magnetic equator, and to prove the equality of the flattening of the two hemispheres. During the reet of his life he devoted himself mainly to the investigation of terrestrial magnetism; and the value of his labours was recognized by his admission into the Académie des Sciences in 1842. He died in August 1865.

The following are his principal works :—The Partie historique, the Hydrographie, and the Physique of the Voyage autour du Monde sur la Coquille, Paris 1826-1830; and extensive contributions to Becquerel’s Traite de Γ Electricité.

DUPERRON, Jacques Davy (1556-1618), a celebrated French cardinal, was born at St Lô, in Normandy, November 15, 1556. His father was educated fora physician, but on embracing the doctrines of the Reformation became a Protestant minister, and to escape persecution settled at Bern, in Switzerland. Here Jacques Davy received his education, being taught Latin and mathematics by his father, and learning without the aid of any one Greek and Hebrew and the philosophy which was then in vogue. At twenty years of a^o he came to Paris, and was presented to the king by the count of Matignon; and, after he had abjured Protestantism, being again presented by Philip Desportes, abbot of Tiron, as a young man without equal for knowledge and talent, he was appointed reader to the king. He was commanded to preach before the king at the convent of Vincennes, when the success of his sermon on the love of God, and of a funeral oration on the poet Ronsard, induced him to take orders. On the death of Mary Queen of Scots he was chosen to pronounce her eulogy, which, though it contained an attack on Elizabeth of England that the king thought it prudent to disavow, tended to advance both the ecclesiastic’s fame and fortune. When the Cardinal de Bourbon, at the end of Henry III.’s reign, plotted to secure to himself the throne to the prejudice of Henry IV., Duperron is accused of having joined in the plot and revealed to Henry TV. its secrets. However that may be, when the plot failed, and Henry IV. mounted the throne, Duperron enjoyed the favour of that monarch, and in 1591 was created by him bishop of Evreux. He converted Henry to the Catholic religion; and, after the taking of Paris, accompanied the Cardinal d’Ossat to Rome to obtain the removal of the interdict which had been passed upon ...