Part IV.] R. S. Pearson: Antiseptic Treatment of Timber . 
TABLE II. 
Treated, 
Untreated. 
Antiseptic oil with 
which the different 
species of timber were 
treated. 
Number of 
years under 
observation. * 
Number 
origin¬ 
ally 
laid 
down. 
I 
Number 
remain- j 
ing. j 
. 1 
Average 
durability, I 
in years, j 
Number 
origin¬ 
ally 
laid 
down. 
Number 
remain¬ 
ing. 
Average 
durability, 
in years. 
Yrs. mos. j 
I 
Yrs. mos. 
Yrs. mos. 
1. Avenarius Car¬ 
6 10 
12 
9* 
5 2 1 
12 
2* 
10 
bolineum. 
2. Coal Tar 
6 10 
12 
2 
3 9 j 
12 
2 
2 10 
3. Jodelite 
6 9 
12 
7 
5 4 
12 
3 
2 8 
4. Solignum 
6 7 
1 12 
7 
1 5 7 
j 12 
3 
3 3 
5. Pinus excelsa Tar . 
6 5 
| 
3 
| 3 11 
j 12 
l 
4 
2 11 
6. Green oil 
6 0 
1 12 
9 
| 5 8 
] 
12 
1 
4 
_____ 
2 10 
isr OT T?_* Out of 9 specimens shown as remaining, five are now missing,, while one oi tne iw 
untreated specimens is also missing, having been lost, probably stolen, after having been under obse - 
ation for five years and five months. 
By referring to diagram II, it will be seen that the most striking 
results have been obtained by treating soft-wood species ; for instance, 
the Boswellia serraia stake treated with Solignum has lasted six years 
and nine months, and is now in a damaged condition but still serviceable, 
while the excessive damage caused by white-ants and fungus attack 
rendered the removal of the untreated stake necessary after being m the 
ground four months. Or again, the Bornbax stake treated with Green 
oil lasted six years, while the untreated pieces only lasted three months. 
Similar examples can be given with reference to most of the soft-wood 
timbers treated with creosote oils. 
These experiments were carried out primarily with the object of deter¬ 
mining the relative value of these oils, the actual life of any individual 
treated piece being of secondary importance. It is therefore necessary 
to examine Table II in detail. Six antiseptics are dealt with, amongst 
these Coal Tar , which was added as a basis for comparison, as its use 
is universal all over the world and its value recognized. The average 
life up to date of the specimens treated with Coal Tar is three years and 
nine months, while that of the stakes treated with Tar of Finns excelsa 
is three years and eleven months, and therefore these two Tars are of 
about equal value. Jodelite, Solignum , Avenarius Carbolineum and 
Green oil , which are Coal Tar creosote preparations, all show far better 
results than Coal Tar. Of these Green oil stands first, the treated speci¬ 
mens having lasted five years and eight months, out of a possible six 
years. Solignum comes next, the specimens having lasted five years 
'[ 189 ] 
