112 



BEETLES. 



It is in working such points as these that true service- 

 able plans of insect prevention co7isist. We need to 

 know the habits of the crop "pests." If we can get 

 them told to us on application, or can study them 

 in published accounts, of course it saves time and 

 trouble ; but still these accounts, if they are worth 

 our study, are drawn up from observations of habits, 

 just such as we are able to make for ourselves ; and 

 if those who depend for their livelihood on the growth 



Fig. 87. — Elm-bark Beetle, magnified ; and maggot workings in 

 Elm bark. 



of their crops could bo induced to believe in their 

 own powers of gaining the needed information, and to 

 use this, as their knowledge of farm operations would 



