Indian Forest Records. 
6 
[Vol. VI 
be dealt with as the seasoned timber and the antiseptic solutions 
became available. 
3. Results of the Laboratory Experiments. 
In the last publication on this subject, it was only possible to 
give records of durability covering a period of a little over a year. The 
first group of experiments in connection with the Powellizing process 
were commenced in April 1909, the next with Avenarius Carbolineum 
oil, Atlas solution and Coal Tar in June 1909, after which specimens treated 
with the other antiseptics were laid down up till the end of 1914 : the 
majority, however, were laid down between 1909 and 1911. 
In describing these experiments, the classification adopted has been 
to place the oils in two groups, according to the time the. experiments 
have been in progress. The salts are dealt with separately in two groups, 
while the salts and oils combined are dealt with in one group. 
It has not been found possible to tabulate the results carried out 
with the Powellized specimens, together with the other laboratory 
experiments, as they were started at an earlier date by Mr. Troup, formerly 
Forest Economist, and were carried out on different lines. They are 
therefore recorded separately. 
The durability results are shown in diagrams, while a precis of results 
is given in tabulated form. 
ii) First group of Laboratory Experiments. 
Results of Experiments with Powellized specimens. 
Diagram I.* 
This diagram has been prepared with the object of demonstrating 
the durability of the treated, as compared with the untreated specimens 
of each species. The specimens have been under observation from six 
to seven years, so that sufficient time has elapsed to permit all untreated 
and some of the treated woods to decay. 
To illustrate the results obtained as a whole, the following table has 
been prepared, which gives the number of treated and untreated speci¬ 
mens originally laid down: those at present in a damaged condition, 
though still serviceable, and those removed after having been destroyed 
by white-ants or fungus attack :— 
* This will be found in the pocket at the end of this publication. 
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