From the text (p.209) ... 'In form, the forest is naturally quite open. Many glades occur, and the older timber is never found in stands which approach what we have been used to considering full density. The problems to be solved in getting figures on yield of longleaf pine in Tyler County, Texas, were therefore: 1. The separation of the age classes and determination of the yield per acre and age of each. 2. What constitutes the normal, or possible, yield per acre of the species and how far this differs from the actual yields obtained. Since the main object of the study was to get average or actual yields, very large plots could be taken. The size of the plot used was forty acres, and the growth and yield was determined on nine plots, or 360 acres. The average stand per acre was 9,450 board feet, which is a good maximum yield on large areas of pure longleaf lands in this portion of Texas.' © by the Society of American Foresters. Abstract reproduced by permission.