"The work continued to increase and many were converted daily, some under the preaching, some in private meetings and some without any outward means. Several very wicked men were convinced while they were in the bowels of the earth, working in the coal mines. Thus the Lord was pleased to pour out His Spirit in a wonderful manner in public and in private, on the surface of the earth and in the bowels of it, to show His mighty power."
'Lives of Early Methodist Preachers', by Thomas Jackson, Volume V, page 300.