I wonder if this 'recipe' will work
In the fall, bore a hole in the center of the stump about 18 inches deep and 1-1 1/2 inch diameter. Put in about 2 ounces salt-peter and fill the hole with water. Plug it up tight. In the spring, take out the plug. Pour in 8-10 ounces kerosene and ignite. The stump should smolder, but not blaze, to the extremities of the roots, leaving only ashes.
