868 JOURNAL OF FORESTRY 



identifying the data in the note-books during compilation, which is 

 convenient when more than one man is doing the field-work. Bark and 

 sap-wood measurements have been omitted. 



It is recommended that wherever possible a sample plot be laid out 

 in advance of the felling crews, the area measured and fully described. 

 After the felling is completed, the uncut trees down to a prescribed 

 diameter limit are calipered. If this is done, there will be available 

 more complete data to serve as a basis for explaining the differences 

 between the tables secured and those prepared in other localities. It 

 is felt that for the purpose of being able to compare intelligently, even 

 volume tables, and more especially growth tables, prepared in different 

 localities, it is desirable that in addition to the data ordinarily published 

 in connection with them there should be stated the number of trees per 

 acre above a certain diameter limit. This can, of course, be done only 

 where all the trees cut on a prescribed area are measured and the uncut 

 trees above the diameter limit recorded. 



Preparatory to the office computation, the following data are entered 

 in the field note-book. The figures may be inserted above the figures 

 entered in the field. 



Length of time to grow from stump height to height of upper 



end of each log. 

 Height of section (from stump). 

 Scale of each log. 

 Total scale. 



For convenience in computation, it is important that the same order- 

 liness be followed in this part of the work as in the taking of field 

 notes. The computation sheets should be preserved the same as the 

 field notes, to facilitate any checking that may seem desirable and to 

 make easier further computations that may be wanted at a later date. 

 The headings of the computation sheet are as follows : 



1. Tree number (serial). 



2. Height of stump. 



3. Stump d. i. b. 



4. D, b. h. 



5. Volume in feet, board measure. 



6. Age of stump. 



7. Log I : Age and height. Logs 2, 3, etc., ditto. 



8. Merchantable length. 



9. Total height. 



ID. Decade measurements at stump. 



