William Mitchell Gillespie, an American author, born in New York in 1816, died there, Jan. 1, 1868. He graduated at Columbia college in 1834, and spent nearly ten years in Europe in travel and study. On his return to New York in 1845, he was appointed professor of civil engineering in Union college, a post which he held until his death. His published works are:" Rome as seen by a New Yorker, 1843-'44" (1845);" Roads and Railroads; a Manual for Road-making" (1845; 10th ed., 1871); "Philosophy of Mathematics," from the French of Auguste"Comte (1851); The Principles and Practice of Land Surveying (1855); and Treatise on Levelling, Topography, and Higher Surveying," edited by C. Staley (1870).