151 



Record of rate of growth, — This should show the size of 

 the trees experimented on and the mean radius (if rings 

 are counted on stumps) or the mean depth bored (if Pressler's 

 gauge is used), and the average numher of rings per inch of 

 radius. It is usual to group the trees in diameter classes 

 and to calculate the average rate of growth for each 

 class ; as this shows at once the numher of years required 

 for the trees of one class to pass into another. A form of 

 record, such as the following, may be used : — 



Class ob diameteb 



OF TREE. 



Average 



radius or 



depth tored. 



NnmTjer o£ 

 rings count- 

 ed. 



Average num. 



ber of rings 



per inch of 



radius. 



Beuabes. 



Below 12 inches dia- 

 meter. 



Pressler' 



8-1 

 2-0 

 2-3 

 1-5 

 1-8 

 2-0 



Stump 



5-2 

 5-1 



4-6 



Average for 



s gauge. 



26> 

 21 f 

 36) 

 20) 

 26) 



a*]" 



countings. 



78 

 51 



74 



class 



11-4 

 11'7 

 13-2 



150 

 10-0 

 161 



13 



In moist valley. 



On high ridge, hut good 



soil. 

 VaJley moist. 



Stiff loam soil, valley. 

 Limestone soil, valley. 

 On exposed ridge, hut fair 

 shelter. 



