118 



CIVIC BIOLOGY 



whole battle would be won for the season. The first commu- 

 nity that does this with absolute thoroughness, and whose 

 every member is intelligent enough to realize the 143,000 

 bushels that one pair might propagate in three months, will 

 first be free from the world-wide, time-old plague of the 

 " house fly, disease carrier," and from the diseases it carries. 



1 2 3 



Fig. 59. Outdoor fly exterminator as adopted for manvifacture 



1, attached to garbage can {make hole in cover as large as inside of ring, to let 



in plenty of light) ; 2, on ring with which attachment is effected ; 3, on its own 



good-sized bait pan. Designed by the author 



Sketch a plan which shall prevent all flies — typhoid, stable, 

 horn, and flesh flies — from either feeding or breeding about 

 your own home. If the fight is carried out of doors into the 

 camps of the enemy, this becomes one of the easiest problems to 

 solve m the whole range of insect life, and its solution com- 

 pletely relieves us of the need of screen windows and doors, 

 as far as flies are concerned ; and, expense aside, screenless 

 windows and doors in summer are a luxurv. 



