A discourse containing a serious address to persons of several ages and characters : in three parts. I. To children. II. To parents. III. To young people. Delivered Lord's-Day October 31, 1756, at the West Parish in Lancaster: on occasion of the late mortality in that and the neighbouring places. Devoted to the service of the parish. By John Mellen, A.M. Pastor of the Church of Christ there. [Ten lines of Scripture texts].