378 
Philippine Journal of Science 
1918» 
to time they were dug out for inspection. After eliminating the 
infested blocks, the remainder were buried again. This ex- 
periment was carried on for three years, starting on June 24, 
1910 (Plate XI, fig. 1). Dates of inspection: July 4, 1911; 
July 14, 1912; July 14, 1913. 
Table XLII . — Result of the experiment. 
Date of inspection. 
Preservative. 
Num- 
ber. 
Infes- 
ted. 
Blocks. 
Dry rot. 
No 
dam- 
age. 
Dam- 
age. 
Dry rot. 
P. ct. 
P. ct. 
July 4, 1911 
6 
5 
0 
o 
100 0 
0 
July 14, 1912 
7 
5 
2 
o 
71 4 
28 6 
July 14, 1913 
4 
3 
1 
o 
7ft 0 
2ft 0 
Do 
3 
3 
o 
o 
100 0 
o 
Do 
5 
0 
0 
5 
0 
0 
Do 
Avenarius Carbolineum 
3 
i 
0 
2 
33.3 
0 
Do 
3 
2 
o 
1 
66.7 
0 
Do __ 
4 
2 
0 
2 
50 0 
0 
Do 
4 
3 
1 
0 
75.0 
25.0 
Do 
Wood-preservative B 
3 
3 
0 
0 
100.0 
0 
As shown in Table XLII, none of the chemicals except Carbo- 
lin, Avenarius Carbolineum, Stop-rot, and Carbolineum Atlas is 
effective in preventing the attack of Odontotermes formosanus 
and fungi as well. It is rather striking that the above-named 
four chemicals, which are more or less effective, are the high 
fraction of coal tar, mainly consisting of anthracene oil dis- 
tilled at a temperature above 270° C. Moreover, the percentage 
of damage is inversely proportional to the amount of the an- 
thracene oil. 
Table XLIII . — Relative values of preventives and the percentage of anthra- 
cene oil in each. 
Preventive. 
Damage. 
Anthra- 
cene oil. 
Per cent. 
66.7 
Per cent. 
60.5 
50.0 
62.5 
33.3 
76.0 
0.0 
83.0 
It is evident, therefore, that the anthracene oil is a factor 
in determining the effectiveness of those chemicals. 
