Pakt IV.] R. S. Pearson: Antiseptic Treatment of Timber. 97 
treatment which will fit for tropical use as railroad sleepers 
or in structural works. It is only necessary that a study 
should be made of the requirements of India, in order that 
British Columbia may be in a position to fill those require¬ 
ments. 
The sleepers have only been recently laid in the line; so, at 
present, they tell us nothing, their behaviour in future 
years will be watched with considerable interest.” 
(3) Conclusions, based on the above Experiments. 
rhe experiments carried out in India in recent years, with sleepers 
tieated under pressure have, with the exception of a few creosoted sleepers, 
laid in the North-Western Railway and Creopine laid in the Bengal and 
North-Western Railway, all been in progress so short a time that no 
•data as to the durability of the sleepers are available. The creosoted 
Silver fir, Spruce, Chir 5 pine and 4 Blue 5 pine, laid in the line four 
years ago are in fair condition, while the Creopine have shown a life of 
.six years only, which is not satisfactory. 
The Assam experiments show that Dipterocarpus pilosus timber 
treats without any difficulty, but that Terminalia myriocarpa will require 
special treatment even to make it take up 6 lbs. to 8 lbs. of oil and Bis - 
ehofia yavanica is obviously difficult to treat under any conditions. Of 
the sleepers sent to Europe for treatment, Dipterocarpus turbinatus from 
the Andamans, D. alatus from Burma, D. pilosus from Assam, and Pinus 
bngifolia from the United Provinces, all gave excellent results, while 
Dipterocarpus tuberculatus from Burma, Terminalia Manii from the 
Andamans, T. tomentosa from the Central Provinces and T. myriocarpa 
from Assam all showed reluctance to take up the oil, and though most 
of them can probably be dealt with satisfactorily, they will require 
special treatment to make them take up the required amount of creosote. 
A sufficient number of sleepers of these species of timber have now 
been laid down by the Railways of India, to assure definite data being 
obtained in years to come as to their value when treated by the various 
processes described above. 
PART VI. 
FACTORS GOVERNING THE TREATMENT OF TIMBER. 
(1) General. 
It is necessary to deal separately with each factor on which the 
successful treatment of Railway sleepers depends, as they vary widely 
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