160 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
rootlets of the trees can resist the entrance of the rhizomorphous 
filaments, except when their vitality and functional powers are 
weakened after insect attacks. 
Although exterminative measures have now been employed 
continuously for several years against these destructive weevils, 
they are only gradually being got rid of. Careful inspections 
are constantly being made all the year round, and stems found 
attacked are felled and barked to prevent the issue of the perfect 
insects. In addition to this, decoy stems and branch-sections 
are left on the ground to act as traps for egg-laying, and are 
then barked to destroy the eggs. 
In conclusion, it may be remarked that the whole of the 
domestic water-supply of the town of Carlsbad is derived from 
these town-woods, whence it is conducted in pipes. 
, 
. 
: 
