Gun powder

The gun having the flint lock, the boy amused himself with bringing down the hammer and striking fire. By this action powder was jarred into the pan, and the gun, which was heavily charged with shot, was discharged, the contents passing through the band-box of caps, cutting them literally to pieces and scattering them over the floor.
Billy gathered up the fragments, put them in the box and placed it upon the shelf,—he alone aware of the accident.