VI. 



Forest Mensuration 



Par. XXXV. Indirect mensuration of diameter. 



Par. XXXVI. Pressler's telescope. 



Par. XXXVII. Auxiliaries for calculation. 



Par. XXXVIII Tree volume tables. 



Par. 



XXXIX. 



SECTION III. VOLUME OF FORESTS. 



Synopsis of methods for ascertaining the volume of 



forests. 



Estimation of forest volume. 

 Principles underlying the exact mensuration of forest 



volume. 



Field work for exact valuation surveys. 

 Basal assumptions. 

 Selection of sample trees. 

 Draudt-Urich method. 

 Robert Hartig method. 

 Average sample-tree method. 

 Exact mensuration without cutting sample trees. 

 Combined measuring and estimating. 

 Form factor method. 

 Form height method. 

 Volume table method. 

 Yield table method. 

 Distance figure. 



Algon's Universal Volume Tables. 

 Schenck's graphic method. 

 Factors governing the selection of a method of valuation 



survey 



Factors influencing the selection of sample plots. 

 Sir D. Brandis method. 

 Pinchot-Graves method on Webb estate. 

 The gridironing method. 

 Forest reserve methods. 

 Sample squares. 

 Pisgah Forest method of 1896. 

 Pisgah Forest method for stumpage sale, bark sale and 



lumbering operations. 



Henry Gannett's method, adopted for the Xllth census. 

 A forty method used in Michigan. 

 Dr. Fernow's forty method used at Axton. 



CHAPTER II. AGE OF TREES AND OF FORESTS. 



Age of trees cut down. 

 Age of standing trees. 

 Age of a forest. 



