360 DINODERUS MINUTUS. 
generation in the year, z.e., they had developed from eggs laid 
probably at the end of February or beginning of March. | 
wished to try and find out— 
(1) How many more generations of the beetle appeared 
in the year. 
(2) Whether the oil treatment was of any use. 
Experiments. 
The bamboos picked to experiment with were good 
examples of their class of treatment, and on receipt they were 
placed in boxes constructed of tin foil and provided with close- 
fitting tops of wire gauze, ‘The boxes were so made that there 
was no chance of anything inside getting out or anything 
from without getting in: and they answered admirably. The 
whole experiment was personally carried out by myself in order 
to ensure accuracyin the observations. In each box were placed 
specimens of differently treated bamboos. The experiments were 
commenced on the 29th April. The following are the. results 
obtained :— 
(1) That neither the five days in water nor that immersion 
followed by a further five days in CuSo, are of any use as a pro- 
tection against the beetles. It is true that the first experiments 
seemed to prove that these; soakings were effective, since the 
bamboos in these boxes had remained unattacked. attribute 
this, however, solely to the fact that the pieces of bamboos, 
selected at haphazard inthe Telegraph Workshops and placed 
in the closed boxes in April, when the beetles were egg-laying, 
did not happen to have had eggs deposited in them and, conse- 
quently, when they were placed in the beetle-proof boxes and 
protected against the beetles they showed no attacks. All the 
subsequent experiments with these classes of treatment showed 
that they are no 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. 
