WITH THE HELP OF YIELD TABLES. 



107 



O lo -io to <to to 60 To go do loo uo 1 



AGE. 



Fig. 38. Graphic representation of the Basal Areas per Acre. 



lo Zo 'so 



Fig. 39. Graphic representation of the Height Growth. 



the following equation may be assumed to hold good (see figure 

 40): 



rr . _ v . -, 

 ' a u a v a+n v a+n 



and 



