DANA, JAMES DWIGHT (1813-1895 ), American geo logist, mineralogist and zoologist, born in Utica, New York, on the I2th of February 1813. He early displayed a taste for science, which had been fostered by Fay Edgerton, a teacher in the Utica high school, and in 183o he entered Vale College, in order to study under Benjamin Silliman the elder. Graduating in 1833, for the next two years he was teacher of mathematics to midship men in the navy, and sailed to the Mediterranean while engaged in his duties. In 1836-37 he was assistant to Professor Silliman in the chemical laboratory at Yale, and then, for four years, acted as mineralogist and geologist of a United States exploring ex pedition, commanded by Captain Charles Wilkes, in the Pacific ocean (see WILKES, CHARLES). His labours in preparing the reports of his explorations occupied parts of thirteen years after his return to America in 1842. In 1844 he again became a resi dent of New Haven, married the daughter of Professor Silliman, and in 185o, on the resignation of the latter, was appointed Silli man Professor of Natural History and Geology in Yale College, a position which he held till 1892. In 1846 he became joint editor and during the later years of his life he was chief editor of the American Journal of Science and Arts (founded in 1818 by Benjamin Silliman), to which he was a constant contributor, principally of articles on geology and mineralogy. A bibliographi cal list of his writings shows 214 titles of books and papers, be ginning in 1835 with a paper on the conditions of Vesuvius in 1834, and ending with the fourth revised edition (finished in February 1895) of his Manual of Geology. His reports on Zoo phytes, on the Geology of the Pacific Area, and on Crustacea, summarizing his work on the Wilkes expedition, appeared in 1846, 1849 and 1852-1854, in quarto volumes, with copiously illustrated atlases; but as these were issued in small numbers, his reputation more largely rests upon his System of Mineralogy (1837 and many later editions in 1892) ; Manual of Geology (1862; ed. 4, Manual of Mineralogy (1848), afterwards entitled Manual of Mineralogy and Lithology (ed. 4, 1887) ; and Corals and Coral Islands (187 2 ; ed. 2, 189o) . In 1887 Dana revisited the Hawaiian Islands, and the results of his further investigations were pub lished in a quarto volume in 189o, entitled Characteristics of Volcanoes. By the Royal Society of London he was awarded the Copley medal in 18 7 7 ; and by the Geological Society the Wollas ton medal in 1874. His powers of work were extraordinary, and in his Band year he was occupied in preparing a new edition of his Manual of Geology, the 4th edition being issued in 1895. He died on the 14th of April His son EDWARD SALISBURY DANA, born at New Haven on the 16th of November 1849, is author of A Textbook of Mineralogy (187 7 ; new ed. 1898) and a Text Book of Elementary Mechanics (1881). In 1879-8o he was professor of natural philosophy and then was professor of physics at Yale. He died June See Life of J. D. Dana, by Daniel C. Gilman (1899) .