PINE BEETLE. 61 
with the occurrence of great gales of very recent years were of much 
practical interest as confirming on a very broad scale the principle 
laid down in all good forest practice, that, to prevent infestation of 
Pine Beetles, their nursery-grounds should not be allowed to exist. 
But in the past season, such special further observation has been 
made of injury by Pine Beetle attack occurring over a large area in 
connection with many thousands of trees being blown down by the 
gales of 1898 and 1894 that the subject is worth reference to again as 
showing how the effects of these great gales not only cause present 
loss of much timber, but, if not attended to, lay the foundation of a 
successive yearly destruction to a very serious amount. 
The worst attack, it will be seen, was on the great Haddo House 
property near Aberdeen, on which Mr. J. Clark (forester) is purposing 
to set on foot carefully considered measures to check the progress of the 
infestation; but to those not fully acquainted with the Pine Beetle 
and its life-history, the following short account may usefully precede 
Mr. Clark’s notes, to show the reasons of his proposed operations. 
Mother beetle and larval galleries. 
The damage done by the beetles to the shoots of the Pines, and 
the numbers of these which are found on the ground beneath the Fir 
trees, or perishing upon them consequently on the central part having 
been tunnelled away for some inches in length by the beetles, is what 
usually draws attention to the presence of the attack. But it is not 
in these burrows that the beetle lays its eggs and the maggots feed. 
The regular course of operations is for the beetles to appear in April 
and May, and the females then bore their galleries by piercing a little 
hole through the bark of boughs, or young trees lately felled, wind- 
fallen timber, &c., and there cach female gnaws a tunnel just below 
