Part IY.J R. S. Pearson: Antiseptic Treatment of Timber. 33 
between the treated and untreated Terminalia belerica sleepers is very 
marked : the former lasted up to 8 years, the latter only one year. The 
Terminalia tomentosa sleepers have done best: six out of ten are still 
in the line after 8 years, being still serviceable, whereas all the untreated 
sleepers were rejected within seven years. The Carey a arbor ea sleepers 
have done better than might have been expected : four treated sleepers 
.are still in the line and are in fair condition, whereas all the untreated 
sleepers were rejected within seven years. The Pinus Klnasya have done 
moderately well, three still remaining after 9 years. 
In the case of all the above species, the treated compare favourably 
with the untreated sleepers. From former experiments carried out on 
an extensive scale with untreated sleepers of Dipterocarpus tuberculatus 
and D. alatus, it was ascertained that their life is about 4 years, 
while that of Terminalia tomentosa sleepers is from 5 to 7 years, 
so that it may be stated definitely that these three species are consider¬ 
ably benefited by Powellizing. This is an important point, as all three 
species are plentiful in Burma. 
(vi) Experiments with Powellized sleepers on the Bombay, Baroda 
and Central India Railway. 
An experimental lot of 5000 Red Sarayah (probably Shorea leprosula) 
Powellized sleepers were laid down in February 1911, on the Idar-Brah- 
makhed Extension of the Bombay, Baroda and Central India Railway. 
The Executive Engineer, Sabarmati, inspected these sleepers in June 
1917 and reported as follows :— 
“ I made an inspection of these sleepers on 18th June 1917—• 
“ White-ants : —There had been rain subsequent to the sleepers having 
been opened out. This tended to remove traces of white-ants. How¬ 
ever, I broke open several sleepers that showed signs of attacks from 
white-ants and am forwarding you 2 typical pieces of these sleepers 
which, to my mind, prove clearly that, at least after a period of over six 
years, the process does noh-cause timber to be immune from attacks 
of white-ants. You will notice that the wood in process of being destroyed 
is quite sound and also that the ants have riddled well into the central 
part of the sleepers. When these sleepers were broken open the white- 
ants were in evidence in great numbers. 
“Renewals : —Previous to April 1916 no sleepers were renewed. Since 
then 300 sleepers have been renewed out of the 4,100 Powellized sleepers 
put in from mile 55-5 to 57-11. This gives a renewal percentage of 7*3. 
“ From my inspection I consider that 10 per cent, should now be 
renewed. Of these sleepers the greater number have become unservice¬ 
able owing to cracks and a lesser number owing to the timber having 
[ 163 1 
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