KERRY WOODS. 



GROUP XIII. 1,530 ft. Elevation. 



The height-growth of this group lies slightly below that of 

 Schiffel's Class IX. medium density of canopy. The crop charac- 

 teristic corresponds very well, as does the mean diameter, but the 

 number of trees per acre is somewhat high, and this, with a larger 

 form factor, gives too high a volume per acre. 



A comparison of this group with Group IX., which lies very 

 close to it, shows that both correspond very closely to Quality 

 Class IX., and differ from each other according to their densities 

 in exactly the way Schiffel's Tables would lead one to expect. 



Degree of Approximation Attained. 



The leading fact brought out by the comparison of the above 

 groups with Schiffel's Tables is that the diameter has been con- 

 sistently larger in the former. In the first instance, these trees 

 were girthed, and it was then found that the calculated diameters 

 were too large. The groups were consequently carefully calipered 

 after a season's growth, and the results (as indicated on p. 12) 

 are those utilised above. 



It would hardly be expected that groups which have been treated 

 somewhat irregularly would show perfect accordance with ideal 

 woods, and it must be noted in this connection that Group I., 

 which was the best grown crop, shows the nearest approximation 

 to the tables. Group IA. is also reasonably close, although it 

 has been neglected for a number of years. Neglect has been of 

 less importance in this particular case, since the canopy has been 

 dense throughout. It is quite conceivable that groups such as 

 V. and VI. should show greater diameters than indicated in the 

 tables. In such exposed positions the leading shoots are fre- 

 quently broken back by the wind, and consequently the height- 

 growth suffers considerably; but the diameter-growth only to a 

 much smaller extent. Determination of the quality class on the 

 basis of age, height and canopy density is therefore likely to 

 give low results. 



The differences indicated between the diameters (and volumes) 

 of these sample plots and the tables may be due to differences of 



