JONSON ABSOLUTE FORM QUOTIENT 589 



region, logs were cut preferably to certain fixed diameters and lengths. 

 The trees having been tallied in certain fixed diameters size classes, 

 the average tree of each class is then analytically cut up into logs of 

 the desired size and the result multiplied by the number of trees in the 

 respective classes. It is to be noted that the smaller the range of 

 each class the more accurate the results will be. 



The analytical procedure is therefore a question of applying taper 

 tables to certain trees of given height, diameter and form class. In 

 the Jonson Absolute Form Quotient tables, the taper in per cent of 

 d.b.h. is given for trees of different height and form classes. Thus, 

 in making up the analytical log output, one picks out the proper 

 height and form class and works up each tree finding at what height 

 the different log diameters are to be found. 



Certain handy devices such as the local tree taper chart local height 

 and volume tables are commonly used. I also applied the ordinary 

 engineering graphical charts while in Sweden about five years ago 

 and have found they very handy. There are many ways of putting 

 up hand book data just through using the form quotient as a key. 

 Ihope to give out some of the above in a future article. 



Timber Estimate of a Whole Region 



There is no material difiference in the use of form quotient volume 

 or taper tables for a cruise applying to a whole region, with the pro- 

 cedure outlined for a single stand. 



Generally speaking the following methods present themselves : 



1. — One can treat each stand individually. 



2. — When the cruising only covers a small area, say, a few thou- 

 sand acres, or summarized figures only, are desired, one can deal 

 witli the whole cruise in lump figures. 



3. — One can arrange the stands in groups or categories and deal 

 with each category as one did with the stand. 



There is nothing special to remark about the first and second pro- 

 cedure. The one gives very exact detailed results but entails con- 

 siderable clerical work, the other does not necessarily give accuracy 

 for any individual stand, but the total results should be very close. 

 The sample trees for this last mentioned summarized procedure should 

 be gathered in some objective manner over the whole region, for in- 

 stance, five or ten trees every quarter mile, one or more trees for 

 every so many tallied, etc. The idea being to secure enough material 

 to give definite curves. 



