should, when practicable, have the damaged and infested parts removed, 

 and likewise burned. 



Where it is not practicable to remove the infested parts, the material 

 may be subjected to one or more of the following methods for the 

 destruction of the insects, and the prevention of further attack, provided 

 in each case the treatment is not detrimental to the wood for subse- 

 quent uses : 



1. A liberal application of pure kerosene, benzine, gasoline, formalin 

 brine, or like substances, to the infested parts. 



2. Thorough steaming of the wood in a tight room. 



3. Subjecting the wood to the highest practicalile dry heat in a dry 

 kiln. 



In the case of finished products such as furniture, museum specimens, 

 and the like, which are portable, they may be subjected to the treat- 

 ment mentioned under" 1," "2," and "3," selecting the one which is 

 least injurious to the articles. In the case of painted or varnished 

 articles which would be mjured by external treatment, the licjuid may 

 be injected into the holes made by the insects, or in small gimlet holes 

 made for the purpose, to be afterwards filled with putty. With inside 

 hardwood finishings, such as wainscoting, staircases, floors, doorposts, 

 and the like, the injection of the liquid is perhaps the only practicable 

 method of checking the progress of the injury. 



When infested construction timbers are l)adly damaged, or important 

 parts are weakened b}' the work of the insects, thej^ should be removed 

 and replaced by sound heartwood material, while all slightly damaged 

 accessible wood should be treated with an external or internal applica- 

 tion of a suitable liquid remedj'. 



Methods of pre renting attacli. — In the case of lumber and other manu- 

 facturers' and merchants' supplies, the following precautions should be 

 taken to prevent the introduction and subsequent multiplication of the 

 insects, as well as to prevent the development of favorable conditions 

 for their attack. 



To accomplish this end a general cleaning up and the immediate 

 destruction of all useless and infested material, and the proper treat- 

 ment of the slightl}^ injured and infested wood, is of primary impor- 

 tance. Special precautions should also be taken as follows : 



1. To prevent the introduction into the lum))er-3'ards, store-houses, 

 and factories, of infested material, remembering that the insects \nQ.y 

 be thus carried to or from all parts of the world in wooden articles. 



2. The fact that the older material forms the most attractive condi- 

 tions for the attack of the insect suggests the importance of preventing 

 the accumulation of such material b}" converting it into the finished 

 products within two or three years, or less time, after it is taken from 

 the tree. 



