Paet I.] Peak s ON : Antiseptic treatment of Sleepers. 15 
The Dipierocarp sleepers were treated at Pyinmana in Burma, by 
B. Gyan Singh, the writer’s assistant. The solution used was two parts 
Earth Oil and one of Solignum, of which each Metre Gauge sleeper 
took up 4*7 lbs. 
The Terminalia tomentosa sleepers were treated at Shahpur in the 
Betul District with one part of Solignmn and two parts of Earth Oil, 
each Broad Gauge sleeper taking up 9-77 lbs. of the mixture. 
The Assam Hardwoods, of which details are given in Appendix IV, 
were treated at Jaipur, in the Lakhimpur Division of Assam, in 1915. 
The solution used was Green Oil, which is a good grade creosote, mixed 
with equal quantities by weight of Assam Earth Oil. The amount 
taken up varied from 0-5 lb. to 25 lbs. per Metre Gauge sleeper, 
according to species. These experiments were supplemented at the 
same time by treating sleepers under pressure at Digboi, details of 
which are given in section 6. 
‘ Chir ’ sleejms treated with a mixture oj 40 per cent. Solignum and 60 per 
cent. Earth Oil. 
The ‘ Chir ’ sleepers were laid in three separate places on the Feroze- 
pur-Macleodganj Section of the North Western Kailway in November 
1914. They were last inspected at the end of May 1921, and have there- 
fore been 6| years in the line. None have been rejected to date, while 
86 per cent, are in classes ‘ A ’ and ‘ B ’ and 14 per cent, in class ‘ €.’ The 
rail-cut is insignificant under the bearing plate, while there are slight 
signs of white ant attack in two cases. The sleepers may therefore be 
said to be doing well, though how much longer they will last cannot 
at present be estimated. 
‘ Kail ’ sleepers treated with a mixture oj 40 per cent. Solignum and 60 
per cent. Earth Oil. 
The ‘ Kail ’ sleepers were laid at the same time in continuation of 
the above ; 94 per cent, are in classes ‘ A ’ and ‘ B ’ and 6 per cent, in 
class ‘ C,’ They are therefore doing slightly better than the ‘ Chir.’ 
‘ In ’ sleepers treated with a mixture oj 33 per cent, oj Solignum and 67 
per cent, oj Earth Oil. 
The Metre Gauge ‘ In ’ sleepers treated at Pyinmana had been 6 
years and 2 months in that section of the line at the date of the last 
inspection. Their condition is still good, though a few have been 
attacked to some extent by white ants. Of 470 sleepers laid down, 437 
[ 15 ] 
