An useful tractate to further Christians of these dangerous and back-sliding times, in the practice of the most needful duty of prayer Wherein are discover'd the nature, necessity and successe of fervent prayer: many objections answered, several practical cases of conscience resolved; and all briefly applied from this text, viz. James 5. 16. The effectual fervent-prayer of a righteous man availeth much. Being the substance of several sermons preached in the town of Columpton in Devon. / By William Crompton M.A. minister of that part of Christs Church there.