=Dewees, William Potts.= _Pa._, 1768-1841. A once popular physician of Philadelphia, professor of obstetrics in the University of Pennsylvania. His literary style was bad, yet his writings were widely circulated in the profession and highly valued. Medical Essays; Physical and Medical Treatment of Children; System of Midwifery; Practice of Medicine. _See Gross’s Sketches of Contemporaries._ =Dewey, Chester.= _Ms._, 1783-1867. A botanist who as an educator was connected with various colleges, and lastly with the University of Rochester. Besides a History of Herbaceous Plants of Massachusetts, he wrote an elaborate monograph on the Carices of North America, the result of many years’ labour. =Dewey, Melvil.= _N. Y._, 1851- ----. The librarian of Columbia College and director of the New York State library. Library School Rules; The Decimal Classification and Relation Index. =Dewey, Orville.= _Ms._, 1794-1882. A Unitarian clergyman of conservative opinions, once prominent as a pastor in New York and Boston. Unitarian Belief; Discourses on Human Life; The Old World and the New; Letters on Revivals; Problems of Human Life and Destiny; Education of the Human Race, comprise his principal writings. _See Autobiography and Letters, 1883._ _A. U. A._ =De Witt, Benjamin.= 1774-1819. A New York physician and scientist who published Oxygen; Minerals in New York. =De Witt, John.= _N. Y._, 1821- ----. A Reformed Dutch clergyman, professor in the Theological Seminary at New Brunswick, New Jersey, 1863-92. The Sure Foundation and how to Build on It; The Psalms, a New Translation (1891); What is Inspiration? _Rev._ =De Witt, John.= _Pa._, 1842- ----. A Presbyterian clergyman, professor at Princeton Theological Seminary since 1892, and the author of Sermons on the Christian Life. =De Witt, Simeon.= _N. Y._, 1756-1834. A once famous surveyor who is commonly held responsible for the classical nomenclature of places in central and western New York. He published Elements of Perspective. =Dexter, Henry Martyn.= _Ms._, 1821-1890. A Congregational clergyman of prominence in Boston as editor of The Congregationalist, 1867-90. He was a positive, dogmatic writer, much addicted to historical and religious controversy. His most important work is The Congregationalism of the Last Three Hundred Years. Handbook of Congregationalism; Pilgrim Memoranda; The Verdict of Reason; As to Roger Williams and his Banishment, a marked example of special pleading; History of the Old Plymouth Colony; History and the Study of History; The Right Use of Books; The Study of Politics, include the greater number of his other works. _C. P. S. Har._ =Dexter, Samuel.= _Ms._, 1761-1816. A jurist of Boston who was secretary of war under President John Adams. Letters on Free Masonry; Progress of Science, a poem; Speeches and Political Papers.