PROBLEM 128 



153 



zjever sta^^ 



Notice that the malarial parasite passes part of its life history in the body of the 

 mosquito, and part in the human body. The lower part of the figiire rojire- 

 sents a blood vessel in man. The parasites live part of their lives in the blood 

 corpuscles. Then they multiply and break out of the corpuscles. (See right 

 side of figure.) Using this figure and information from your Civic Biology, 

 work out the complete life history of the malarial parasite. 



What happens if these organisms are taken into the mosquito's 

 body ? 



Note. — Only when both forms of cells are taken into the body of the mo.squitt) 

 arc the parasites able to continue their development there. 



Conclusion. — How might malaria be transmitted? 



JProblem 128 : To study tlie life history of the typhoid jly. 



Materials. — Raw meat, glass chshes. 



Method. — Expose pieces of raw beef where flies will light on 

 them. After a few hours eovei* in glass dishes or small hatlery 

 jars with screen covers. 



Observations. — Watch the meat. In pieces on which eggs wtM'c 

 laid by the fiies describe the stages of development as they appear. 

 Do the larvae grow any? They are called fnn(j(jols. ITow do the 



