BIOLOGICAL INVESTIGATIONS. 



INSTRUCTIONS. 



Upper parts of sheet contain all measurements and counts made in the 

 forest (columns a to n). 



Number trees measured in the same camp and conditions consecutively ; 

 underscore, whether standing free or crowded, or note briefly other con- 

 ditions of position and give surrountiing species. Use 4-foot rule and 

 gauge. In all cases if possible take -two measurements of diameter at 

 rlglit angles and note average. 



(a) Take diameter about 44 feet from ground (breast liigh) or from 

 root collar if soil has sunk away. 



(6) Timber: from butt to first limb of crown. 



(d) From first crown-forming limb to top. 



(e) Found by cutting leader off and back until only five rings can be 

 counted. 



(/) Height : taken from ground or collar. Age : supposed number of 

 years for the young tree to have attained lieight of stump (three to ten 

 years, according to height of stump ) . 



(Ji) Sections are numbered beginning witli butt section. 



(I) Count along a rule laid across the heart of the cut, beginning from 

 outer circle; note number of rings at eacli iucli. If radii are of different 

 lengths, as is often the case, then find the average radius to count on. 



(in) Measure diameter with gauge and the wood with rule : difference 

 will give double thickness of barlv. 



(n) Measure diameters with gauge at distances from butt-end as 

 indicated in column. 



Age of tree is found by adding columns/ and g. Total height, found 

 by adding columns/, 6, and d. 



( o) Age found by deducting each count in Ic from age of tree. Heights, 

 by adding to height in (/) lengths in /t, consecutively. 



(|)) Found from graphic chart by interpolation. 



Millimeters. Inch. 



•2 =0.1 



3 



4 



5 =0.2 



6 



7 =0.3 



S 



9 



10 = 0.4 



11 



1-2 = 0..") 



13 



