The methods of measurement described in this Booklet are intended to be used primarily in connection with the sale of standing timber. The procedures described involve the use of tariff tables which have been used for this purpose by the Forestry Commission since 1956. The tariff system of measurement has subsequently proved efficient and reliable, provided that the recommended procedures have been correctly followed. Whereas previously the use of the tariff system was confined to certain clearly defined conditions, it is now considered better to use the tariff system than any other method of measuring standing timber, in almost any kind of crop. The system described here can be applied to both thinnings and fellings.