Part IV.] R. S. Pearson: Antiseptic Treatment of Timber. 15* 
that out of twelve treated specimens four have had to be removed, and 
that four others are already seriously damaged, does not hold out any 
great hopes that this solution will prove to be suitable when employed 
under Indian conditions. 
(vi) Sixth group of Laboratory Experiments. 
Experiments carried out with Cresol-Calcium, Aczol and Barol. 
These antiseptics are combinations of salts and oils, so mixed together 
as to form emulsions. They are the results of an attempt to overcome 
certain difficulties in connection with treatment of timber with salts 
alone. To overcome these difficulties, and at the same time to reduce 
the cost of treatment, such substances as Cresol-Calcium, Aczol and 
Barol have appeared on the market. These preparations aim at com¬ 
bining a salt with an oil and treating the timber with both at the same 
time ; later on, under “ Field Experiments,” the results of treating 
timber first with a salt and when dry with an oil will be discussed. 
The timber treated with Cresol-Calcium, was immersed in a 10 per 
cent, solution for 7 days. The concentrated solution when mixed with 
water resembled an emulsion of lime, and gave off powerful phenolic 
and cresolic fumes. Aczol is also a patent solution, probably made up 
of phenolic substances and copper. To prepare the solution, 2 oz. of 
Aczol were mixed with 20 oz. of Ammonia Hydrate and 50 lbs. of water 
and the specimens allowed to remain in this solution for 24 hours. Barol 
is advertised as a preservative containing oil of great wood-preserving 
qualities and copper compounds. The timber in this case was immersed 
in a solution heated to 90°C., for one hour and allowed to remain in the 
liquid for a further period of 23 hours, while it cooled down. 
Diagram VI.* 
Diagram VI illustrates the durability of the specimens treated with 
Cresol-Calcium, Aczol and Barol. 
When studying this diagram, it must be borne in mind that the Cresol- 
Calcium experiment has been in progress five years and five months, and 
that the Aczol and Barol experiments have only been in progress between 
two and two and a half years, hence the want of uniformity of the lines 
of durability. 
The following table summarizes the position of affairs in respect to 
this group of experiments :— 
♦ This will bo found in the pocket at the end of this publication. 
[ 145 J 
