102 
and those which remained could be burnt out by piling over 
them the surrounding timber. This would of course en- 
hance the cost of clearing perhaps by $10 or even $20 per 
acre, a small consideration in comparison to the damage 
that may be effected by T. Gestroi. 
Further advantages of more thorough clearing, would 
be less liklihood of vacancies caused by Femes semitostus 
and a saving in the cost of weeding, in fact of every other 
work carried on in the clearing, together with easier and 
consequently more efficient a supervision. 
Cost of Eradication by destruction of timber 
CONTAINING TERMITARIA. 
It is obviously impossible to give even approximate 
figures with regard to cost; this depends entirely on the 
quantity of timber to be removed. One ten acre block may 
contain a dozen large Kumpas and Meranti trees and the 
adjoining fifty acres may contain only half a dozen. I he 
cost may vary from $2 to $20 per acre and it will be neces- 
sary to estimate for each ten or twenty acre block sepaiate- 
ly. 
In opening new clearings it is false economy to cut 
down expenditure on clearing and it will obviously he fai 
cheaper to eradicate T. Gestroi in clearings before they aie 
planted than afterwards to say nothing of the saving in the 
cost of other works and the satisfaction of knowing that 
the only two pests which we have to fear have been 
eradicated. 
T. Gestroi is frequently found in nibong palms but ow- 
ing to the facility with which these can be split up and the 
many uses they can be put to they do not cause any serious 
troulDle or expense. 
Drains as affecting Terms Gestroi. I have not in a 
single instance found the runs of termites crossing a sub- 
soil drain, excepting by means of a fallen log or wooden 
bridge, it follows therefore, that the more frequent the 
drains, the more circumscribed will be the attack of the 
termites, provided that iron or concrete bridges are used 
instead of wooden ones and that all timber lying across 
drains be removed. 
The mound termites, T. Malay anus, and T. carbonarms 
seem to prefer the edge of a drain for the construction of 
their termitaria but Gestroi apparently considers the suit- 
ability of timber only and not that of soil in choosing its 
home. 
