833 



ample: D. b. h. 

 (cinder area). 



JOURXAL OF FORESTRY 



10.3" — height = 44'— then volume = 9.1 cubic feet 



D/AMeT£:fl BR£ASr-/-t/6H /N /NCH£3 



Not only do these charts make possible more rapid transcription of 

 volume data, but there is less chance for error than where mathe- 

 matical interpolation from the regular tables is made. Also, as noted 

 in the first part of this article, considerable eye strain and consequent 

 danger of error are eliminated. 



3 The periodic measurements of trees on sample plots involve the exact in- 

 crease in diameter and height. Diameters are measured with a tape and heights 

 with a hypsometer. Since all trees are tagged it is possible to determine the 

 exact periodic increase in volume for each one. 



