TABLE OF CONTENTS XVU 



CHAPTER XXX 

 THE DETERMINATION OF GROWTH PER CENT 



PAGE 



327. Definition of Growth Per Cent 429 



328. Pressler's Formula for Volume Growth Per Cent 429 



329. Pressler's Formula, Based on Relative Diameter 430 



330. Schneider's Formula for Standing Trees 431 



331. Use of Growth Per Cent to Predict Growth of Stands. 432 



332. Use of Growth Per Cent to Determine Growth of Stands by Comparison 



with Measured Plots 433 



333. Use of Growth Per Cent in Forests Composed of All Age Classes 434 



334. Growth Per Cent in Quality and Value 435 



CHAPTER XXXI 



METHODS OF MEASURING AND PREDICTING THE CUR- 

 RENT OR PERIODIC GROWTH OF STANDS 



335. Use of Yield Tables, in Prediction of Current Growth 436 



336. Method of Prediction Based on Growth of Trees, with Corrections for 



Losses 436 



337. Increased Growth of Stands after Cutting 438 



338. Reduced Growth of Stands after Cutting 438 



339. Application of Yield Tables Based on Age, to Cut-over Areas 441 



340. Permanent Sample Plots for Measurement of Current Growth 443 



341. Measurement of Increment of Immature Stands as Part of the Total 



Increment of a Forest or Period 443 



342. Comparative Value of Current Growth versus Yield Tables and Mean 



Annual Growth , , , , , 445 



CHAPTER XXXII 



COORDINATION OF FOREST SURVEY WITH GROWTH 

 DETERMINATION FOR THE FOREST 



343. Factors Determining Total Growth on a Large Area 447 



344. Data Required from the Forest Survey 447 



345. Site Qualities, Separation in Field 448 



346. Relation between Volume and Age of Stands 449 



347. Averaging the Site Quality for the Entire Area 449 



348. Growth on Areas of Immature Timber 450 



349. Effect of Separation of Areas of Immature Timber on the Density Factor 



for Mature Stands 453 



350. Stand Table by Diameters for Poles and Saplings; When Required 454 



APPENDIX A 

 LUMBER GRADES AND LOG GRADES 



351. Purpose of Log Grades 455 



352. Grades of Lumber 455 



353. Basis of Lumber Grades 455 



