Returning to Washington in 1844, he published another report, and upon its completion set out on another exi)edition to the Pacific, tlie result of which was the acquisition of California by the United States. He was sent to Washington in 1850 as the first United States Senator from California. In 1856 he was the Republican candidate for President of the United States and during the Civil War held a commission as major-general in the Union army. A superb edition of his reports, entitled "Fremont's Exi)iorations," was published in 1859.

Among other names associated with the history of Westchester County which have attained to distinction in literature are those of J. Rodman Drake, John Savage, William Leggett, Robert Rogers, David Humphreys, Guliau C. Verplanck, Ann Eliza Bleecker, Mrs. Haven, James Parton, Rev. Thomas Allen, a chaplain of the Revolutionary army at White Plains, who took an active part in the political discussions of the time; Charles Tafin A rmand, the Marquis de la Rouarie, an eloquent and persuasive speaker and writer, who, in 1778, was actively engaged in Westchester County in opposing Simcoe, Emmerick and Baremore, the Loyalist, whom he captured near King's Bridge November 8, 1779; Aaron Burr, who was stationed in Westchester County in the winter of 1778- 79, and whose duel with Hamilton took place at Weehawken ; Nathaniel Chipman, LL.D., the Vermont jurist, who participated in the battle of White Plains ; Joel Barlow, the author of the " Columbiad," and Rev. William Crosswell, D.D., clergyman and scholar, born at Hudson, November 7, 1804, and died at Boston November 9, 1851 ; James De Lancey, the jurist, born in 1703 and died in 1760; General Oliver De Lancey, of the British army, who fought at White Plains ; Horace Green, M.D., LL.D., the distinguished physician and medical writer, who died at Greenmount, Sing Sing, N.