APPLIED BIOLOGY 



stagnant ponds. This will destroy the larvse when they come 



to the surface to breathe. Oil cannot be used if it is desired 



to preserve plants and fishes in the water. 



(3) People should guard against infec- 

 tion by avoiding mosquito bites, especially 

 when in a region where malaria is known 

 to occur each year, or when there is an 

 epidemic of yellow fever in the southern 

 states. The methods of avoiding bites 

 are very simple. Houses should be well 

 screened, and isolated mosquitoes resting 

 on the walls and ceilings of bed-rooms 

 should be killed each evening. Persons 

 obliged to be outdoors at night should 

 wear thick and loose clothing, and mos- 

 quito-proof veiling around the head. 



(4) Persons suffering from malaria should 

 remember that their duty to their fellow- 

 men demands that every possible precau- 

 tion be taken against being bitten by 

 mosquitoes. A drop of blood from a ma- 



, respira- larious patient may infect a mosquito so 



that later H ma y in J ect the malarial or an - 



of abdomen; g, isms into healthy people. In cases of 

 gills attached to ye n ow f ever it i s now the rule to quaran- 



last segment. B, J . , 



pupa ; o, eye ; be- tine the patient in a screened room, and 

 tween the eye and then make sure that no infected mosqui- 



abdomen are the . .,, . i i i_ i 



cases containing toes escape. This can be done by closing 

 antenna, legs, and the room tightly after removal of the pa- 

 ro^tube^Tpad-" tient and burning sulphur which will kill 

 dies at end of ab- any mosquitoes concealed in the room. 



Especially should the above precautions 

 be taken against malaria when Anopheles 

 mosquitoes are common. Hence, it is important that this 

 species be easily identified. See Fig. 138. 



B 



FIG. 139. A, mos- 

 quito larva; h, 

 head ; t, thorax 

 o, eye ; r 



domen. 

 Folsom.) 



(From 



