132 



CIVIC BIOLOGY 



Watch for eggs, and examine the water for larva}. How 

 many eggs were laid and how long did they take to hatch? 

 Wherever yon have found mosquitoes breeding, indicate 

 it upon a map of the locality with letters, A denoting the 

 presence of Anopheles; C, Culex; and I 7 , Aedes. Fig. 01 

 shows the relation between malaria and the Anopheles mos- 

 quitoes as worked out in this way by a biology class. 



FIG. 69. Vivarium set up for studying mosquitoes 

 Cheesecloth top with sleeved opening and glass dish of water in moss at one cn<l 



Did you find that, in general, Anopheles breed by preference 

 in spongy bogs and stagnant water, green with alga3 ; Aedes in 

 cisterns, tanks, buckets, tubs, rain barrels, flowerpots, saucers, 

 flower vases, and water pitchers; Culex pipiens in ditches, 

 stagnant pools, catch basins, or in any water near homes, 

 indoors or out? But algae may quickly change any neg- 

 lected water into a green bog hole for Anopheles to breed in. 



