Part II.] Pearson: Antiseptic Treatment of Timber , 
67 
Absorption of the Solution by Indian Timbers. 
From experiments carried out at the Forest Research Institute 
it was found that a period of immersion of 15 minutes in a hot 
solution was insufficient in the case of hard woods, such as Bipterocarpus 
tuberculatus (“In” wood), Anogeissus latifolia and Pterocarpus macro - 
carpus (Burman Padauk), and that it would have to be prolonged to 
several hours at least, otherwise only a very thin shell of the timber would 
be affected which would be quite insufficient to ensure protection for 
any length of time. 
Plate VI, specimens a , b and c illustrate sections of Boswellia 
serrata , Pinus excelsa and Picea Morinda respectively which have been 
immersed for 15 minutes in Jodelite, heated to just below boiling point, 
while specimens d , e and f illustrate sections of Pterocarpus macrocarpus 
(Burman Padauk), Pinus longifolia and Shorea robusta (Sal) .a is a 
soft wood; in this case the oil has saturated the outer tissue to a con¬ 
siderable depth, b, c and e are conifers, which have probably been 
sufficiently impregnated for use as posts but not for sleeper purposes, 
while the d and f show hardly one-eighth penetration and would 
therefore require more drastic treatment. The remarks made on page 
57 as to the method of calculating the absorption of Avenarius Carlo- 
hneum by various timbers apply equally to Jodelite. Experiments 
similar to those carried out with Carbolineum oil were carried out with 
Jodelite, the only difference being that the timber in this case remained 
15 minutes in the solution as compared with 10 minutes in the case of 
Carbolineum. The quantity of the solution absorbed by the different 
species is tabulated below :— 
© 
<x> 
w 
’So 
<D 
K 
Species. 
Superfi¬ 
cial area 
of piece 
treated. 
Volume 
of piece 
treated. 
Weight 
of 
specimen 
before 
treatment. 
Weight 
of 
specimen 
after 
treatment. 
Weight 
solution 
absorb¬ 
ed. 
Absorp¬ 
tion per 
superfi¬ 
cial 
surface. 
Absorp¬ 
tion per 
cub. ft. 
sq. ft. 
cub. ft. 
lbs. oz. 
lbs. oz. 
lbs. oz. 
oz. 
oz. 
i 
Boswellia serrata 
1*55 
0-11 
4 2 
4 7 
0 5 
3’23 
45 56 
3 
Pinus longifolia 
I'll 
0-06 
1 11 
1 1 14 
0 3 
271 
50-0 
5 
Pin lit excelsa 
1-11 
0-06 
1 8 
1 9 
0 1 
0*91 
16*66 
( HO ) 
