xiv TABLE OF CONTENTS 



PAGE 



228. Methods of Estimating which Utilize Types and Site Classes. Corrections 



for Area 292 



229. The Use of Correction Factors for Volume 293 



230. Methods Dependent on the Use of Plots Arbitrarily Located 297 



231. Estimating the Quality of Standing Timber 297 



232. Method of Mill Run Applied to the Stand 299 



233. Method of Graded Volume Tables Applied to the Tree 299 



234. Method of Graded Log Rules Applied to the Log 299 



235. Combination Method Based on Sample Strips and Log Tally 300 



236. Limits of Accuracy in Timber Estimating : 301 



237. The Cost of Estimating Timber 302 



238. Methods of Training Required to Produce Efficient Timber Cruisers 303 



239. Check Estimating 308 



240. Superficial or Extensive Estimates 308 



241. Estimating by Means of Felled Sample Trees 310 



242. Method of Determining the Dimensions of a Tree Containing the Average 



Board-foot Volume 311 



243. The Measurement of Permanent Sample Plots 312 



Pabt III 

 THE GROWTH OF TIMBER 



CHAPTER XXII 

 PRINCIPLES UNDERLYING THE STUDY OF GROWTH 



PAGE 



244. Purpose and Character of Growth Studies 315 



245. Relation between Current and Mean Annual Growth 316 



246. The Character of Growth Per Cent 318 



247. The Law of Diminishing Numbers as Affecting the Growth of Trees and 



Stands 318 



248. Yields, Definition and Purpose of Study 320 



249. Yield Tables 321 



250. The Application of Yield Tables in Predicting Yields 322 



251. Prediction of Growth by Projecting the Past Growth of Trees into the 



Future 323 



252. The Effect of Losses versus Thinnings upon Yields 324 



253. The Factor of Age in Even-aged versus Many-aged Stands 325 



254. The Tree or Stem Analysis and the Limitations of its Use 326 



255. Relative Utility of Different Classes of Growth Data, and Chart of Growth 



Studies , 327 



CHAPTER XXIII 

 DETERMINING THE AGE OF STANDS 



256. Determining the Age of Trees from Annual Rings on the Stump 335 



257. Correction for Age of Seedling below Stump Height 336 



268 Annual Whorls of Branches as an Indication of Age 337 



259. Definition of Even-aged versus Many-aged Stands 337 



