244 The N.Z. Journal of Science and Technology. [July 
Kamahi treated with zinc chloride averaged 384 grm. (0-624 lb.) of dry 
salt per cubic foot, and twelve specimens showed no decay after twelve 
months. 
Table VII. — Sodium-fluoride Tests. 
Name of Wood. 
Test. 
Weight 
before. 
Weight after. 
Decay. 
Dry Salt injected 
per Cubic Foot. 
Grammes. 
Grammes. 
Grammes. lb. 
Red-beech 
1 
81-67 
89-17 
50 
• • • - 
Rimu sap 
1 
65-95 
72-17 
60 
• • • . 
White-pine sap 
1 
65-00 
74-50 
60 
. • { 
White-pine heart . . 
1 
. . 
. . 
Red-beech 
2 
81-60 
99-60 
30 
Rimu sap 
2 
63-57 
75-80 
40 
White-pine sap 
2 
40-30 
61-30 
50 
. . 
White-pine heart . . 
2 
45-50 
. . 
. . 
. . 
Red-beech. . 
3 
85-60 
122-20 
10 
140 0-30 
Rimu sap 
3 
66-80 
98-60 
10 
120 0-26 
White-])ine sap 
3 
43-60 
68-90 
• 
30 
. 96 0-22 
Duration of test, fourteen months. 
Table VIH.—Powellizing Solution Tests. 
Name of Wood. 
' 
Test. 
Weight before. 
Weight after. 
Decay. 
Red-beech 
1 
Grammes. 
97-50 
Grammes. 
101-70 
80 
White-pine sap . . 
1 
39-65 
42-35 
100 
White-pine heart 
1 
46-50 
48-25 
60 
Rimu sap 
1 
50-32 
52-17 
100 
Red-beech 
2 
95-65 
102-50 
80 
White-pine sap . . 
2 
39-00 
42-85 
60 
White-pine heart 
2 
48-30 
52-10 
80 
Rimu-sap 
2 
54-90 
58-50 
100 
Red-beech 
3 
106-70 
117-50 
80 
White-pine sap . . 
3 
38-60 
46-00 
60 
White-pine heart 
3 
47-25 
54-15 
80 
Rimu sap 
3 
51-00 
57-35 
100 
Duration of test, fourteen months. 
CONCLUSIONS. 
The general value of preservative treatment will be obvious when 
it is remembered that the control pieces had undergone decay sufficient 
to permit crushing by hand, while in no case, except in the powellizing 
tests, did the decay exceed 60 units according to the scale adopted — i.e., 
60 per cent. 
