The forest pruner, or, Timber owner's assistant : being a treatise on the training or management of British timber trees, whether intended for life, ornament or shelter, including an explanation of the causes of their general diseases and defects, with the means of prevention, and remedies where practicable : also, an examination of the properties of English fir timber, with remarks on the defects of the old, and the outlines of a new system for the management of oak woods /