Adjoining the Maria Mitchell homestead is a memorial astronomical observatory and library, containing the collections of Miss Mitchell and of her brother, Professor Henry Mitchell (1830-1902), a distinguished hydrographer.
JEAN MATHIEU DE CHAZELLES (1657-1710), French hydrographer, was born at Lyons on the 24th of July 1657.
1797), the hydrographer; Malcolm Laing (1762-1818), author of the History of Scotland from the Union of the Crowns to the Union of the Kingdoms; Mary Brunton (1778-1818), author of Self-Control, Discipline and other novels; Samuel Laing (1780-1868), author of A Residence in Norway, and translator of the Heimskringla, the Icelandic chronicle of the kings of Norway; Thomas Stewart Traill (1781-1862), professor of medical jurisprudence in Edinburgh University and editor of the 8th edition of the Encyclopaedia Britannica; Samuel Laing (1812-1897), chairman of the London, Brighton & South Coast railway, and introducer of the system of "parliamentary" trains with fares of one penny a mile; Dr John Rae (1813-1893), the Arctic explorer; and William Balfour Baikie (1825-1864), the African traveller.
Another brother was Alexander Dalrymple (1737-1808), the first admiralty hydrographer, who distinguished himself in the East India Company's service and as a geographer.
MATTHEW FONTAINE MAURY (1806-1873), American naval officer and hydrographer, was born near Fredericksburg in Spottsylvania county, Virginia, on the 24th of January, .1806.