328 forestry Quarterly. 



site map is included the usefulness of the timber sale map does 

 not cease with the completion of the sale. 



One of the good points of a site-quality volume table for Lodge- 

 pole pine based on d. o. b. on the stump instead of D. B. H. is the 

 ease with which it can be applied in computing the volume of tim- 

 ber cut in trespass. Trespass usually occurs in good stands which 

 yield much brush and under which abundant advance growth is 

 found. These conditions necessitate, in logging, heavy swamp- 

 ing which causes the removal or misplacement of the tree tops, 

 the only indicators of the total or merchantable heights of the 

 trees. For these reasons other forms of volume tables cannot be 

 used with as great accuracy as the site volume table, for in the 

 latter the estimates may be secured by the use of the soil factors 

 as means of determining the height of the trees. 



Sawlog-tie-prop tables of any form are valuable only as indi- 

 cators of how certain pine stands will run in sawlogs, ties and 

 props. As a rule accurate estimates of these classes of material 

 on specific operations cannot be secured for the following rea- 

 sons : A tie table can only give results for ties of certain specifica- 

 tions {y"yi7" in this case), while on the other hand, railroad tie 

 contracts call for ties varying from 6" to 10" faces, and their tie 

 inspectors are not uniformly rigid in their inspections, often al- 

 lowing undersized ties to be "run through." Moreover, the de- 

 gree of utilization of trees practiced by the tie choppers varies. 

 Some will cut and others will not cut into ties, large tie-sized 

 trees, small tie-sized trees, trees swelled at the base, and limby- 

 boled trees. These variable factors make it undesirable to spend 

 too much time and money in the preparation of tables which give 

 results in feet B. M., number of ties and linear feet of props; 

 for that reason the site-quality, sawlog-tie-prop table given in 

 this article h based on but 206 trees, and yet it serves the purpose 

 for which it was intended. 



Since this volume table is probably the first of its kind for 

 Lodgepole pine, a good deal of comment has been made in re- 

 gard to its accuracy and its applicability to all Lodgepole pine 

 stands. 



The table can, of course, only be used for large averages, like 

 any other volume tables it does not give correct answer for in- 

 dividual trees. Check tests on 62 trees, taken at random, gave 



