98 PINE. 



Where the beetles are numerous the infestation is liable to cause 

 great loss by the perforations in the solid timber, but as yet (so far as 

 I am aware) we have not much of what may be called " commercial 

 observation" of this in Britain, i. e. little complaint of damage, and 

 (in case trouble should arise) we greatly need to have more observations 

 from foresters in tJiis countr}/. 



The attack is entered on in most elaborate detail by skilled German 

 writers of the highest standing, but the accounts do not always wholly 

 agree, and in my endeavour to give a reliable history of these bark 

 beetles by collation of many publications I have met with such diffi- 

 culties that I offer it under submission to corroboration in some 

 (though perhaps not very important) points of detail to future practical 

 British observation. 



We need (I believe) notes of what the time is (in this country) of 

 the appearance of the successive broods of the beetles ; that is, what 

 is the date in spring, and also whether besides the summer brood 

 there is a third in autumn. Also more information as to amount of 

 attack, and of preference of the beetles for egg-laying on felled or 

 sickly trees, &c., and how far removal of the bark acts as a trustworthy 

 preventative of infestation. Also there is a difference in statements as 

 to the customary form of the brood galleries in T. domesticum ; also as 

 to whether T, linentum wholly confines its attacks to the wood of 

 coniferous trees. If we had information on these points from foresters 

 accustomed to observation, so that we might know definitely what does 

 take place in different localities, it would much facilitate dealing with 

 the attack, should it prove on trustworthy practical investigation to 

 require attention. 



I may perhaps be allowed to add that, as a comprehensive digest of 

 information up to date of publication, a very serviceable amount of 

 entomological and practical information will be found at pp. 228-232 

 of Prof. W. R. Fisher's volume on ' Forest Protection,' for reference 

 to which see ante, p. 93. 



