American educationist, railroad president, and writer upon philosophical subjects, born on the 4th of August 1808, at New Preston, CT. His father was Jeremiah Day, a president of Yale College. The son graduated from Yale in 1828, and, after several years’ service as a tutor in his alma mater, spent two years in European travel, becoming, shortly after his return in 1836, pastor of the Congregational Church in Waterbury, CT. From 1840 until 1858 he occupied the chair of rhetoric and homiletics at Western Reserve College, in Cleveland, OH, managing, meanwhile, the Cleveland and Pittsburg railroad. After 1858 he devoted himself to the duties of the presidency of Ohio Female College, and, resigning in 1864, removed to New Haven, CT, where he undertook the preparation of textbooks on philosophical subjects for use in colleges. These include The Art of Discourse; Elements of Logic; Logical Ethics; Science of Thought; and The Elements of Psychology.