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The writer’s best thanks are due to Messrs. Billson, Milward, Channel, 
Lyall and Bailey for help rendered in obtaining sleepers with which to 
carry out tests and in carrying out experiments in the United Provinces ; 
to Messrs. Leete, Marsden, Davis and Hefferman, all Burma Foresters, 
for assistance rendered in connection with supplying and treating sleepers 
at Pyinmana ; to Mr. Copleston for treating Terminalia tomentosa sleepers 
in the Bombay Presidency ; to Messrs. Thompson and A. L. Chattarjee 
for help rendered while treating sleepers in the Betul Division of the 
Central Provinces ; and to Messrs. Perree, Jacob and Cooper for all 
the assistance they rendered in connection with the Assam experiments. 
Also to the Hon’ble Mr. A. B. Hawkins, Manager of the Assam 
Oil Co., for allowing him to carry out experiments in the Company’s Pres¬ 
sure cylinder, which had been especially adapted for the purpose and for 
much help rendered and kindness shown, without which it would not 
have been possible to carry out the experiments with Assam species 
of timber. 
On two occasions, Messrs. Rodger and Cox respectively acted for the 
writer while he was on leave, during which periods the experiments were 
in their charge, while to Mr. R. S. Troup, a former Forest Economist, is 
due the credit of the idea of restarting this enquiry, though he was 
transferred in 1909 before he was able to formulate'a complete scheme 
of investigation. 
During the course of the enquiry much valuable assistance has been 
obtained from Messrs. Howard, F.Weiss and Clyde H. Teesdale, Research 
Officers of the United States', Foresi Service, who most kindly assisted 
the writer by supplying him with records of the results of their experi¬ 
ments and experience ; while acknowledgments are due to several Rail¬ 
way Engineers, wl^o have, on many occasions, rendered assistance in 
order to facilitate the inspection of experimental sleepers in the line. 
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