"The trunk is regularly marked around in deep cuts, which begin close to the branches and go down almost to the roots. A ladder is used to mount to the upper part of the trunk, and the cuts, or incisions, are made with a long knife or with an axe. Then they strip off the sheets of cork between the circles. This operation is a very delicate one, and requires much care and skill lest the inner part should be injured. If the operation is carried out successfully, the cork-like substance will grow again and become as abundant as ever.