I03 BULLETIN No. S7 



We would be better prepared to realize the enormous number 

 of birds in a given area, if we would stop to consider that 1280 

 individuals to the square mile would mean but a single pair to 

 the acre ; certainly a very small force to battle against the de- 

 structive rodents, innumerable noxious weeds, and myriad in- 

 sect life. 



