Conversations on natural philosophy, in which the elements of that science are familiarly explained, and adapted to the comprehension of young pupils. Illustrated with plates. By the author of Conversations on chemistry, and Conversations on political economy. Improved by appropriate questions, for the examination of scholars; also by illustrative notes and a dictionary of philosophical terms. By J. L. Blake, A.M. Rector of St. Matthew's Church, and principal of a literary seminary, Boston, Mass.