Part IV.] It. S. Peabson: Antiseptic Treatment of Timber. 7 
TABLE I. 
Treated. 
Untreated. 
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40 
The outstanding feature of the above results is that, after being 6 
to 7 years in the ground, not a single untreated specimen is now 
absolutely sound, while only 19 are still serviceable, thus clearly 
indicating the drastic conditions under which the timber was tested. 
The treated specimens compare very favourably with those which 
were not treated ; omitting those which were lost while the experiment 
was in progress, 50 per cent, of those treated as against 32 per cent, of 
the untreated specimens remain and are still serviceable. Another 
way of illustrating the results obtained, is to calculate the average life 
of the treated and untreated specimens, basing the calculation on the 
time they have been in the ground up to the last date of inspection. 
By so doing, we find that the average life of the treated pieces up to date 
is five years and two months and of the untreated pieces, three years and 
seven months. As time goes on, this difference will increase in favour of 
the treated timber, as already over 66 per cent, of the untreated, as 
against under 50 per cent, of the treated specimens, have been removed. 
From the above results, it might be argued that Powellizing does not 
really protect the timber from decay or white-ants, as nearly half 
the treated specimens have had to be removed within seven years. This 
would be a correct assumption, were it not for the fact that many of the 
timbers tested are of an extremely perishable nature such as, for 
instance, Nos. 3, 6,40, 26, 44,45,46,47,51, 65, 69 and 74, which probably 
nothing but a very heavy absorption of coal-tar creosote would render 
sufficiently durable to enable them to last seven years. 
[ 137 ] 
