178 THE INVISIBLE WORLD 



is caused by the bite of a mosquito. That mosquito 

 is the Anopheles. Its habits are nocturnal ; it does 

 its mischief by night. Seek protection against 

 this foe. 



First, protect those sick with the fever. The 

 mosquito cannot infect the well until it has bitten 

 the sick. Inserting its proboscis through the skin 

 of the patient, it draws blood, and with the blood, 

 germs into its proboscis and stomach. Then, and 

 only then, biting a well person, that person is in- 

 fected by the germs. Protect the sick. Keep 

 every mosquito from the patient's room. 



Then protect the well. In localities where the 

 mosquitoes abound, screen the doors, windows, 

 beds. Keep the foe from you. 



Yet the best way to protect, is to exterminate the 

 mosquitoes. They abound in swamps, marshes and 

 lowlands. Hence, in such localities the fever pre- 

 vails. Dry up these places. In the stagnant pools 

 mosquitoes lay their eggs, hatch their larva, and 

 thus produce new swarms of the pest. Drain the 

 swamps, marshes, lowlands. Spray them with 

 kerosene. This kills the larvae and the mosquitoes, 

 too. Dry up these breeding places. Plow them. 

 Cultivate them. On them raise bountiful crops. 



Several states have made war against the com- 

 mon foe along this line, and with signal success. 

 Continue the war until the last foe expires. Drive 

 the malarial poisoner from the world, and malarial 

 fever will be no more. 



