132 



CIVIC BIOLOGY 



Watch for eggs, and examine the water for hirva'. I low 

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

 AVherever yon have fonnd mosqnitoes breedmg, indicate 

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

 presence of Anopheles; (7, Cnlex; and Y, Aedes. Fig. 61 

 shows the relation between malaria and the AnopJieles mos- 

 qnitoes as worked ont hi this 'way by a biology class. 



Fig. 69. Yivariuin set up for studying mosquitoes 

 Cheesecloth top with sleeved opening and glass dish of water in moss at one end 



Did yon hnd that, in general, AnopheleH breed by preference 

 in spongy l)ogs and stagnant water, green with algic ; Aedes ui 

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

 flower vases, and water pitchers ; Cidex pijnens in ditches, 

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

 indoors or ont ? Bnt algae may quickly change any neg- 

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



