The want of labourers in the gospel harvest, considered and improved: in a sermon preached July 30, 1775, on occasion of the much lamented death of the Reverend and Learned Caleb Ashworth, D. D. Tutor of the Dissenting Academy at Daventry in Northamptonshire. To which is added, a postscript, containing some Hints, with a View to the Interest of Religion among the Dissenters. By Samuel Palmer