586 JOURNAL OF FORESTRY 



universal table the correction factors for each species and diameter 

 class, which are in reality the form factors. If there were good form 

 factors available (such as those obtained by Bruce's method) it would 

 seem to me that this method was intensely practicable and one that 

 would make an enormous saving in office work, at some sacrifice of 

 field work, however. 



Whatever form of table is adopted, or whatever method of con- 

 struction is used, it is most essential that every table should contain 

 a full explanation of its construction. The user of the table must 

 know how the table is made, otherwise he will not cruise to the table 

 and will not make the proper allowance, for allowance must be made 

 in the use of any table. There is more chance for error in the unintelli- 

 gent use of the table than there is in the construction of the table 

 itself. It is the duty of the maker of a table to have it so clear on all 

 points which afliect its value that the cruiser can use it as it was intended 

 that it should be. 



