18 
Indian forest Records. 
[VoL. IX 
{in) ‘ Hollong ’ sleepers treated with Earth Oil and SoUgnum. 
‘ Hollong ’ {Dipterocarpus pilosus), one of the commonest timbers of 
North Assam, lends itself easily to treatment. The 191 sleepers laid 
down in the line near Moriani nearly six years ago, were treated under 
pressure at Digboi, and absorbed 11-2 lbs. per sleeper in 15 minutes at 
100 lbs. pressure. They were fairly seasoned before treatment, an 
important factor governing their future behaviour when laid in the 
line. The sleepers are doing well, there is no sign of white ant attack 
or rot setting in, while the spikes are holding well. The 6 per cent, 
of renewals are all due to cracking when the sleepers were first put in 
the line. 
(iv) ‘ Sam ’ sleepers treated with Earth Oil and SoUgnum. 
A few ‘ Sam ’ {Artocarpus Chaplasha) sleepers were treated and put 
in the line over five years ago. They are doing well as 85 per cent, 
are still in class ‘ A.’ No defects were noticed at last inspection except 
a slight tendency to warp. 
(tj) ‘ Jutili ’ sleepers treated with Earth Oil and SoUgnum. 
Some 65 ‘ Jutili ’ {Altingia excelsa) sleepers were treated at Digboi, 
the amount of oil they absorbed is not known, though they were treated 
on the same lines as * Hollong.’ They were laid down from 4 to 5 years 
ago and with the exception of two sleepers, which are showing signs of 
dry rot, they are doing well in every respect. 
{vi) ‘ Gahori Supa ’ sleepers treated with Earth Oil and SoUgnum. 
Twenty-one ‘ Gahori Supa ’ {Magnolia Sp.) were treated under 
pressure and laid in the line over five years ago. The exact species of 
Magnolia to which this timber belongs is not known but it is probably 
Magnolia Pealiana. The sleepers with the exception of two rejected are 
doing well. 
{vii) ‘ Ping ’ sleepers treated with Earth Oil and SoUgnum. 
Eighteen ‘ Ping ’ {Cynometra polyandra) sleepers were treated at 
Digboi and laid in the line over five years ago. Two have been rejected, 
14 are in ‘ A ’ Class and 2 in ‘ B ’ Class. This timber is very common up 
the Borak river and is scarcely ever used, due to its habit of splitting 
badly. From this very limited experiment, so far as can be judged at 
present, there seems to be a distinct possibility of utilising this timber 
ror sleepers after treatment. 
[ IS ] 
