Excerpt from A Method for Constructing Site Index Curves From Measurements of Tree Age and Height, Its Application to Inland Douglas-Fir For many years the most widely followed practice in describing forest site quality has been the use of a quantitative measuring system-site index curves. These must be developed for individual species and are supposed to represent the relationship between height and age of the average dominant and codomin'ant trees on the site. These curves can be derived from measurements that indicate height and age of selected trees at different periods in time, or from measurements of height and age at one point in time on a large number of trees that range in age from young to Old. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.