DUTTON, Arthur Henry, soldier, born in Wallingford, Connecticut, 15 November 1838; died in Baltimore, Maryland, 2 July 1864. He was graduated at West Point in the engineer corps in 1861. He served on the staff of General Mansfield in Washington at the beginning of the war, and then had charge of the defenses of Fernandina, Fla., until he became colonel of the 21st Connecticut regiment on 5 September 1862. While on duty in North Carolina with his regiment, he served as chief of staff to Maj.-Gen. Peck, and subsequently held a similar position upon the staff of Major-Gen. W. F. Smith. After the battle of Drury's Bluff, in which he greatly distinguished himself, he was placed in command of the 3d brigade. While reconnoitering with his brigade in the neighborhood of Bermuda Hundred on 5 June 1864, he came upon the enemy strongly entrenched and almost hidden from view. Being, as usual, on the skirmish line, he was mortally wounded in the beginning of the engagement.

--His brother, Clarence Edward Dutton, soldier, born in Wallingford. Connecticut, 15 May 1841, was graduated at Yale in 1860, and subsequently spent two years in study at New Haven. In 1862 he became 1st lieutenant and adjutant, and shortly afterward captain, in the 21st Connecticut volunteers. He was engaged at Fredericksburg, Norfolk, Cold Harbor, Bermuda Hundred, and Drury's Bluff. In 1863 He was admitted to the U. S. army as 2d lieutenant in the ordnance corps, after passing a severe competitive examination, and was promoted 1st lieutenant in March 1867. Meanwhile he had been stationed at Watervliet arsenal in West Troy, in 1865, and came under the influence of Robert P. Whitfield and Alexander L. Holley, who directed his attention to geology and the technology of iron. For five years his leisure was occupied in the study of these subjects, and in 1870 he read his first paper, "On the Chemistry of the Bessemer Process," before the American association for the advancement of science, at their Troy meeting.

He was transferred to the Frankford arsenal in 1870, and in 1871 to the Washington ar-serial, where he remained until May 1876, having been promoted to captain in June 1873. While in Washington he renewed his studies in geology and devoted considerable attention to the microscope examination of rocks. The officers of the U. S. geological survey noticed his work, and during the summers of 1875-'7 he was detailed for duty in connection with the survey of the Rocky mountain region under Major John W. Powell. The winters of these years were spent in the west as chief ordnance officer of the Department of the Platte. In 1878 he was ordered to report to the secretary of the interior, and subsequently was associated with the U. S. geological survey, being in 1887 geologist in charge of the division of volcanic geology. His work on the geology of the high plateaus of central Utah was begun in 1875 and completed in 1877, and that in the Grand Canon district was finished in 1880. In 1882 he visited the Hawaiian Islands for the purpose of examining the volcanoes, and then made a special study of the great volcanic fields of the northwest.

He began the examination of the Mount Taylor and Zuni district of New Mexico in 1884, and in 1885 began an investigation of the cascade and coast ranges of northern California and Oregon, on which he is now (1887) still occupied. In 1886 he was employed for a short time in studying the causes of the Charleston earthquake, concerning which he prepared a monograph. Captain Dutton is a member of several scientific societies, and in 1884 was elected a member of the National academy of sciences. Besides upward of fifty articles on scientitle subjects, he has published the following government reports : "Geology of the High Plateaus of Utah" (Washington, 1880); "Tertiary History of the Grand Canon District" (1882); "Physical'Geology of the Grand Canon District" (1882); "Hawaiian Volcanoes" (1884); and "Mount Taylor and the Zuni Plateau" (1886).