i6 Forestry Quarterly. 



cutting approximately 20,000 feet of lumber in one 'tower/ and 

 the grading was done by an employee of the mill. In a two band 

 mill three or even more men would be essential to secure the 

 data, but the increase in the size of the crew would, of course, 

 be more or less offset by the greater number of logs tallied each 

 day. Furthermore, in many cases, it might be necessary or 

 desirable to replace one of the crew by an expert grader. How- 

 ever, even with such increases in tlie expense of securing the mill 

 tallies the cost of the tables would not be greatly increased, since 

 a considerable saving in the cost of tabulating the results would 

 be made by not computing grades for logs and trees of each 

 diameter and length. 



Conclusion. 



These facts have convinced the writers that local volume 

 tables can be prepared rapidly and economically if based upon 

 mill tallies made from all merchantable logs. In estimating large 

 bodies of timber local volume tables of this type appear to sim- 

 plify the methods of cruising and to place less emphasis upon 

 the judgment of the cruiser. For, instead of estimating the con- 

 tents of each tree and discounting for defect, the cruiser records 

 diameters, which can be measured, and used-lengths, which can 

 be accurately estimated. If the given conditions which local 

 tables represent are carefully described these volume tables may 

 perhaps be used in other regions by carefully studying and com- 

 paring defects, methods of utilization, etc., and applying suitable 

 converting factors. Furthermore, if the data upon which local 

 volutne tables are based are systematically recorded and kept 

 available, as should be done in all cases, it would be possible in 

 time to construct valuable 'general' tables by combining the data 

 from many localities. At the same time by comparative studies 

 the effects of variations in defect, form, and method of utilization 

 could be determined, and reliable converting factors obtained. 



However, careful tests must be made to determine whether 

 local tables aft'ord in the hands of men of moderate experience 

 more reliable and accurate estimates than existing methods of 

 'cruising' hardwoods. 



In conclusion the writers wish to thank Mr. II. S. Janes for 

 innumerable kindnesses. 



