LEWIS, Henry Carvill, geologist, born in Philadelphia, Pennsylvania, 16 November, 1853. He was graduated at the University of Pennsylvania in 1873, and in 1879 joined the state geological survey as a volunteer, and first investigated the surface geology of southern Pennsylvania, after which he studied the glacial phenomena of the northern part of the state, and traced the great terminal moraine from New Jersey to the Ohio frontier. He furnished numerous papers on the geology and mineralogy of Pennsylvania to the "Proceedings of the Philadelphia Academy of Natural Sciences." He was elected professor of mineralogy in the Academy of natural sciences in 1880, and to the chair of geology in Haverford college in 1883. These places he still holds, although since 1885 he has been engaged in geological studies in Europe, working at microscopic petrology in the University of Heidelberg. He has completed a map of the separate ancient glaciers and ice sheets of England, Wales, and Ireland. Professor Lewis is a member of scientific societies in the United States and Europe, and has contributed to their proceedings and to other scientific periodicals, including the "American Naturalist," of which for some time he was editor of the mineralogical department.