270 WEST VIRGINIA EXPERIMENT STATION. 



or extreme cold or heat, I have not as yet determined, but suf- 

 ficient evidence is had to indicate that with some species it is 

 quite marked, while with others there is no perceptible influ- 

 ence one way or the other. 



While we are powerless to control the climatic conditions, 

 except in a conservation of the forest covering of the spruce 

 area there is much to be gained from a knowledge of the rota- 

 tion of certain climatic conditions to the distribution or destruc 

 tion of noxious insects generally, since we could thus 'indicate 

 what may be expected to follow any abnormal conditions in 

 the climate of any single year or series of years ; also we would 

 be able to tell what insect foes or friends may be looked for 

 within given areas of different elevation within the State. 

 Therefore it is a subject to which I hope to devote considerable 

 attention in the future. 



