McQUILLEN, John Hugh, dentist, born in Philadelphia, Pennsylvania, 12 February, 1826" died there, 3 March, 1879. He was the son of Captain Hugh McQuillen, who served during the war of 1812 under Decatur. He studied in the Friends' schools in Philadelphia, and became a clerk, but devoted his leisure to study. In 1847 he began the study of medicine and dentistry, beginning the practice of the latter in 1849, receiving the degree of M. D. at Jefferson medical college in 1852, and that of D. D. S. at the Philadelphia college of dental surgery in 1853. In 1857 he accepted the chair of operative dentistry and dental physiology in the Pennsylvania college of dental surgery, which he held until 1862, and in 1859 he originated the idea of the American dental association. In 1863, principally through the efforts of Dr. McQuillen, a charter was obtained for the Philadelphia dental college, and he was made dean, and professor of physiology, which offices he held until his death. For several years he was president of the American dental association, the Pennsylvania dental society, and the state odontographic society, and corresponding secretary of the biological and microscopical section of the Philadelphia academy of natural sciences. From 1859 till 1871 he was an editor of the "' Dental Cosmos," a monthly journal, to which he contributed various articles, including a monograph upon " The Action of Anesthetics on the Blood-Corpuscles," which was widely copied and translated. He has written much on the principles and practice of dentistry and dental education, and also in exposition and discussion of histology and microscopy.