YVER DE CHAZELLES, Jean Pierre (ee-vair), French navigator, born in St. Aubin du Cormier in 1709; died there in 1786. In 1750 he obtained the command of an expedition to search for the northwest passage, and, after visiting Iceland, anchored in June at Vagnafjord, on the coast of Greenland, where he built barracks. I[e undertook an expedition to the interior, and discovered a chain of high mountains, which were seen again in 1869 by the Austrian scientific expedition of Karl Koldewey. Resuming his journey, he coasted Greenland, prepared a valuable chart of all its inlets and fjords, and anchored at Vorland island, 81. north latitude. He was the first navigator to reach 81. 30' north latitude, where he was imprisoned by icebergs from December, 1750, till March, 1751, and then drifted to the south, visiting Spitzbergen on the homeward journey. He related the results of his expedition in "Voyage a la recherche du passage du Nord-Ouest" (4 vols., Rennes, 1752-'3). Yver was promoted brigadier-general of the naval forces, and fought with credit in the West Indies, twice relieving Tobago, raising the blockade of Cape Francais in Santo Domingo, and defending St. Vincent and Grenada. From 1764 till 1766 he was occupied in making a chart of the Caribbean sea, and in 1766-'8 he visited Mexico. He made in 1769 an expedition to the coast of Patagonia and the Strait of Lemaire, and retired in 1772, but re-entered active service when France joined in the war for American independence, and was employed in the West Indies and the Indian and Pacific oceans. Yver's works include "Atlas de la met des Antilles" (Rennes, 1773); " Instructions aux navigateurs sur le debouquement de Saint Domingue " (1774); "De Mexico a Acapulco dans le royaume de la Nouvelle Espagne, avec un apereu sur l'5tat politique et la condition sociale des lndiens" (2 vols., 1778) : and " Histoire de la marine Francaise au dixseptieme siecle" (4 vols., 1784-'6).