12 KAURI GROWTH. 
the period during which the seedling or sapling tree had been struggling 
through the dense covert of the under-forest. This dominated heart, 
in every case, was absent from the crown sections. The size of the trees 
counted varied from 3 ft. in diameter to 13 ft. 
The average of the rings of growth, excluding dominated heart as 
above, worked out to 7°88 rings per inch of radius, the size of the trees 
and thickness of the rings being as follows :— 
Diameter ee ox: 
Number of Section. ue eset 
of Tree. Ft. in. Radius. 
‘ 6 0 8 
9 5 O 7 
5 OO 9 
3 0 6 
5 5 6 6 
6 13. 0 8 
i 12 6 7 
3 mw 6 
9 5b 4 8 
10 cat: A 
1 & 9 ee 
19 -J4 0 7 
te ts. «Q 10 
14 i ea T 
15 6 6 7 
16 5 O 8 
17 4 0 10 
134 
Average, 7°88 
The rings were computed by laying a mathematical scale over a 
radius of average length. The computation was not carried beyond 3 ft. 
diameter, which is about the diameter limit of a log of economic size. 
This result, 7:88 rings, may be compared with Cheeseman’s figure 
as above for seven trees not above economic size—viz., 8-2 rings. 
DIAMETER-GROWTH OF EUROPEAN AND Soutu AFRICAN TREES. 
If we take the five standard trees of central Europe, in medium- 
quality forest, the average growth is 10°8 in. diameter at age 100 years, 
according to the standard tables published in Sir William Schlich’s 
‘Manual of Forestry.’’ (See table, p. 14.) 
If at 100 years of age the average diameter is 10°8in. or radius 
o4in., during | year the radial growth is 0°054in. Dividing 1 by 
0°054 we get 18°52: viz., it requires on an average 18°52 years to 
produce an inch of radial growth in European forests. Then comparing 
Schlich’s and Cheeseman’s data one has 18°52 (Schlich) + 9°7 (Cheese- 
man)= 1°91: viz., Kauri average diameter-growth is nearly twice 
European forest trees diameter-growth. The slowest-growing European 
timber-tree at 100 years is Beech with 22 average rings; Oak has 16 
rings. ‘The shade-bearing Silver-fir, which in its mode of erowth most 
resembles New Zealand native trees, has 16°94 rings per fnoh of radius, 
or an inch of diameter-growth in 84 years. It has thus exactly half the 
growth in thickness of Kauri if we take Cheeseman’s Kauri trunks of 
economic sizes only. 
