I? 
further five days in Cu So 4 are of any use as a protection 
against the beetles. 
(2) That the bamboos which had gone through all the stages of 
the treatment and had received a proper soaking in the 
oil tank remained unattacked and in addition were proof 
against further attacks by the beetles. 
(3) That at least five generations of these beetles issued be 
tween the last week in April and the end of October. It 
is probable that many of the beetles of the last generation 
were killed off by a cold snap experienced toward the end 
of the month. 
(_}) That the oil treatment therefore considerably prolongs the 
period of usefulness of the bamboo, this period being, as 
far as the experiments at present show, at least a year. 
(a) I am inclined to recommend that the soaking for live days 
in water should be continued since a thick shiny gelatinous 
substance exudes from the bamboos during this process, 
and this exudation probably enables the bamboo to absorb 
a larger quantity of oil than would be otherwise the case* 
(b) ~ That the soaking in the copper sulphate solution be dis- 
continued since the experiments have shown it to have no 
preservative effect against the beetles. 
(c) That the bamboos be allowed to dry in a covered shed for 
several days after the water process. 
(d) That after the drying the bamboos be allowed to soak 48 
hours in common Rangoon oil. 
The Superintendent ot the Telegraph workshops states that the 
cost of the treatment as carried through by him, i.e, live days in 
water,. 5 days in Cu Sot. followed by several days drying and then 
two separate soakings (at an interval of a couple of months) of 24 
hours each in Rangoon oil, amounts to Rs. 3.5 per 100 6-foot lengths 
or 6.3 pies per length. This includes the labour. 
Omitting the Cu Sot treatment and a second soaking in the oil 
together with the additional handling involved should effect a saving 
in this price, although of course the longer period of soaking in oil 
will enable the bamboos to absorb more of this than they would in 
the shorter one of 24 hours only. 
Ei P. STE BRINGS, 
The Indian Forester , December , rgoj. 
[Note . — It will be remarked that the bamboos experimented on 
were only soaked in water for five days. This we do not consider, 
nearly a sufficient length of time and usually soak, them for two 
months, after which they are not attacked by beetle.- — Ed.) 
