December, '08] JOURNAL OF ECONOMIC ENTOMOLOGY 347 



Some of the results of the practical application of information 

 based on entomological investigations which have been reported or 

 observed may be mentioned as follows : 



The control of the eastern spruce beetle in northeastern Maine and 

 the saving of $100,000 to one firm ; the complete control of the hickory 

 bark beetle on Belle Isle Park, Detroit, Michigan, where the total 

 destruction of one of the attractive and valuable features of the 

 Island was threatened. 



The complete control of an alarming outbreak of the Black Hills 

 beetle in the vicinity of Colorado Springs and Palmer Lake, .Colorado, 

 and the adjoining National Forests, thus protecting the pine timber, 

 which is one of the valuable and attractive features of the region, 

 representing a cash value of several million dollars. 



The complete control of the same insect, which was threatening the 

 destruction of the pine timber on an extensive estate in the vicinity 

 of Garland, Colorado, which would have resulted in a loss of timber 

 and reduced value to the state of perhaps more than a million dollars. 



Our recommendations for the control of powder post insects have 

 been adopted by many of the leading manufacturers of seasoned 

 hardwood products and by dealers and consumers of the same, and 

 it is evident that it has resulted in the saving of many millions of 

 dollars' worth of property. 



The real value, however, of these examples of successful control is 

 far greater than that represented by the amount of property pro- 

 tected, since they have served to demonstrate : 



That some of the most destructive and dangerous enemies of the east- 

 ern and western forests can be controlled at slight or no expense when- 

 evei* the infested timber can be utilized within a given period after it 

 is attacked; 



That manufacturing and business methods can l)e so adjusted that 

 without additional expense a very large per cent, and in many cases 

 all, of the great losses from powder post injury can be avoided ; 



That by the adoption of improved methods of forest management 

 and the proper adjustment of certain details in such management to 

 meet the requirements for prevention of insect depredations, a large 

 per cent of the losses may be avoided without additional expense; 



That, as a rule, it is useless and undesirable to attempt the extermin- 

 ation of an insect enemy of the forest. It is only necessary to reduce 

 and weaken its forces so that it cannot continue an aggressive invasion 

 but must occupy a defensive position against its own enemies and 

 become dependent upon favorable conditions resulting from the 



