XV, 4 
Oshima: Formosan Termites 
357 
Table XV . — Amount of ash and benzene extract in various woods. 
Name of wood. 
Origin. 
Damage. 
Ash. 
Benzene 
extract. 
Per cent. 
Per cent. 
Per cent. 
0. 00 
1.51 
5.98 
India 
0.00 
2. 96 
6.22 
Ipil 
Philippines 
4. 00 
1.37 
0. 68 
8. 00 
2.97 
2.60 
18. 42 
1. 54 
2.31 
24. 00 
2. 58 
0. 004 
India 
30. 00 
2. 00 
3.80 
Philippines 
37.50 
1.43 
3.37 
38.46 
4.25 
0.01 
39.22 
0.75 
0. 15 
42. 86 
2.65 
2.93 
do 
45.45 
5, 26 
0.79 
50. 00 
0.74 
0. 53 
54. 55 
1.00 
2.65 
56. 00 
1.77 
0. 05 
56.25 
0.33 
0. 55 
57. 89 
0. 42 
0. 05 
Pagatpat 
Philippines 
60.00 
3. 74 
0.27 
60. 00 
2. 30 
1.99 
60.00 
6.48 
2.43 
Betis __ 
60. 47 
2.25 
0. 06 
Yellow narra 
60. 87 
1. 87 
2. 23 
Ikuki.. ............. 
62.50 
1.70 
0.37 
Chaaki 
64.29 
1.61 
0. 36 
64.71 
1.05 
0. 14 
Calantas ... 
65.00 
1 82 
1.50 
Tucang-calao 
65.52 
2.44 
2. 19 
Lanutan __ . 
66. 67 
2. 99 
0. 44 
Amuguis 
69.23 
2.41 
1.79 
Acle . . 
69. 77 
1.31 
1.51 
White stringy-bark 
70. 37 
0.62 
0. 16 
Guijo 
71 43 
1 96 
1 13 
Grey box 
76 92 
0 78 
0 40 
Tallow wood__ 
79.41 
0.51 
1.68 
Lim 
Cochin China 
81.40 
0.23 
2.22 
Apitong 
82 76 
0 77 
0 004 
Red mahogany _ 
83.33 
0 58 
0. 26 
Red narra 
85 45 
1 36 
3 80 
Supa 
85.71 
1 56 
0 80 
Jungle wood . 
85. 71 
3 07 
0 11 
Lanete 
87 50 
2 04 
0 002 
Malugay 
90. 00 
3. 13 
0 13 
From Table XV it is evident that no special relationship exists 
between the resistance and the amount of ash and benzene 
extract. It is rather striking, however, that the percentage of 
benzene extract contained in cypress pine and teak, which are 
absolutely immune from the attack, is extraordinarily high. As 
it is probable that some organic compounds extracted by benzene 
are distasteful or repellent to termites, determination of the 
