14 WHY WE STUDY SCIENCE 



army surgeon named Ross, working in India, found after a 

 long series of experiments, that mosquitoes had something 

 to do with malaria. He knew that they were blood-sucking 

 insects, and that they were always present where malaria 



The life history of the malarial parasite. This cut shows parts of the body of the 

 mosquito and of man. The mosquito injects the crescent-shaped bodies into the 

 blood of man. These enter the blood corpuscles, develop spores which, after being 

 released from the corpuscle, form two kinds of cells. These two forms of the 

 parasite are sucked with the blood into the body of the mosquito, where the other 

 part of the life cycle of the parasite takes place. 



was frequent. He reasoned that mosquitoes might carry 

 this germ. He worked a long period of time before he 

 found finally that a certain kind of mosquito, called 

 anopheles, had some unusually tiny bodies attached to the 



