Alexander Keith Johnston, a Scottish geographer, born in Kirkhill, Mid-Lothian, Dec. 28, 1804, died at Ben Rhydding, July 9,1871. He was educated in Edinburgh, and then apprenticed to an engraver, but soon manifested a decided taste for the study of geography. That he might be able to consult the highest geographical authorities in the original, he made himself master of a number of modern languages. He also travelled extensively for scientific purposes. His first important work was the "National Atlas" (1843), which secured his election to the royal geographical society, and his appointment to the office of geographer to the queen for Scotland. In 1848 his "Physical Atlas" was published, and immediately after its appearance he was chosen member of the Gesellschaft far Erdkunde of Berlin, of the geographical society of Paris, and of the geological society of London. His other principal works are: a "Dictionary of Geography " (1850-'52; last ed., 1867); a " Geological Map of Europe," in the preparation of which he was aided by Sir R. I. Murchison and Prof. Nichol; "Atlas of North America" (1858); " Military Atlas to Alison's Europe;" "Royal Atlas of Modern Geography," with a special index to each map (1860-'62, and later editions), the only atlas for which a prize medal was awarded at the London exhibition of 1862; and a series of six library maps of the great divisions of the globe (1863-5).