Take any quan tity of linseed oil, say half a pint; put it into an old pot, or any vessel that will stand the firo without breaking; the vessel must not be more than one-third full, put it on a slow fire, stir it occasionally until it thickens as much as required; this will be known by cooling the stick in water, and trying it with the fingers. It is best to make it rather harder than for use. Then pour it into cold water. It can be brought back to the consistency required with a little Archangel tar.