This early work on wood treatment contains information on the methods and materials involved in treating and preserving wooden poles. The information presented here is based upon such experience and data as are available at the present time and as far as warranted by the information, conclusions have been drawn and recommendations have been made. The conclusions and recommendations are in accordance with what is generally accepted as being the best practice at the present time but they must be regarded as provisional and subject to modification as experience accumulates and as the art of wood preserving progresses.