A philosophical discourse concerning the mutability and changes of the material world; read to the students of Harvard-College, April 7. 1731. upon the news of the death of Thomas Hollis, Esq; of London, the most bountiful benefactor to that society. By Isaac Greenwood, A.M. Hollisian professor of philosophy and the mathematicks. made public, at the desire of the reverend the president and fellows of that society. - Greenwood, Isaac (printed for S. Gerrish, at the lower end of Cornhil, 1731)