XV, 4 
Oshima: Formosan Termites 
371 
evaporated by exposing the blocks to direct sunlight. Thus, a 
considerable number of blocks of pine containing different 
amounts of the oil was prepared. 
The treated blocks were buried in ground infested by Copto- 
termes formosanus. From time to time they were dug out for 
inspection, and only the unattacked samples were buried again. 
This experiment was carried on for nearly two and a half years. 
Table XXVII . — Blocks of Japanese pine treated with solutions of camphor 
green oil. 
[Experiment station, Shakko, near Taihoku. Experiment started August 5, 1914. Blocks 
inspected March 7, 1915 ; August 8, 1916 ; August 28, 1916 ; and March 24, 1917.] 
1 PER CENT SOLUTION. 
Inspected. 
Total. 
Blocks. 
Infested 
No 
damage. 
Damage. 
Per cent. 
March 7, 1915 
39 
39 
0 
100 
2 PER CENT SOLUTION. 
March 7, 1916- 
62 
65 
7 
89 
August 8, 1915 
7 
1 
6 
90 
August 28, 1916 
6 
2 
4 
94 
March 24, 1917 
6 
0 
6 
94 
3 PER CENT SOLUTION. 
March 7. 1915 
67 
51 
16 
76 
August 8. 1915 
16 
9 
7 
90 
August 28, 1916 . 
7 
0 
7 
90 
March 24. 1917 
7 
0 
7 
90 
5 PER CENT SOLUTION. 
March 7, 1916 
59 
11 
48 
19 
August 8. 1915 
48 
15 
33 
44 
August 28, 1916 
33 
3 
30 
49 
March 24. 1917 
30 
2 
28 
58 
10 PER CENT SOLUTION. 
March 7. 1915 
67 
6 
62 
7 
August 8, 1915 ....V 
62 
19 
43 
36 
August 28, 1916 
43 
1 
42 
37 
March 24. 1917 
42 
6 
36 
46 
