8 
Indian Forest Records. 
[Yol. YI 
Another point requiring comment is that of the first 24 treated speci¬ 
mens shown in the diagram, laid down in April 1909, only 7 have failed ; 
of the next 31 specimens, laid down in November 1909, 11 have failed ; 
while of the remaining 22 which were laid down in April 1910, 15 ha\e 
tailed. Such results are not easily explained. Had the first and second 
batches contained no soft woods, the results would explain themselves, 
but this was not the case. The only explanation that can be offered is- 
that the method of treatment was not so thorough in the case of the 
latter batch of specimens, as it was when dealing with the two former, 
the impregnation having, in every instance, been carried out for the 
Forest Department by the Powell Process Company. 
As a whole the results, so far as the Powell process is concerned, 
may be regarded as satisfactory, taking into consideration the drastic 
conditions under which the experiment was carried out. 
(ii) Second group of Laboratory Experiments. 
Experiments carried out with Avenarius Carbolineum oil, Coal Tar,. 
Jodelite, Solignum, Pinus excelsa Tar and Green oil. 
This group of experiments have been in progress from six to seven 
years. 
In the’edge* of-the Avenarius' Cmholineum, Coal Tar , Solignum and 
Pinus excelsa Tar specimens, the treatment consisted in painting on 
the solution hot, a liberal coating being given. In the case of the Jode¬ 
lite and Green oil specimens, the treatment was by immersion in hot 
solutions for 10 to 15 minutes. Details of this work are given in the 
previous publication. 
Diagram II.* 
In the accompanying diagram, the results of the experiments aro 
shown so as to illustrate the relative value of the different antiseptics 
when applied to the different species. To compare the values of the 
different antiseptics, the following table has been prepared, which 
gives the number of specimens of each series still remaining sound or 
sufficiently serviceable not to necessitate their removal, and the average 
life up to date of the twelve treated and twelve untreated specimens of 
each group :— 
* This will be found in the pocket at the end of this publication. 
[ 138 ] 
