68 NATURE STUDY AND LIFE 



clear of wrigglers ? Can they discover anything else that 

 eats mosquito wrigglers in the water ? 



Step by step, as a point is learned, encourage each 

 child to make what practical applications he can. If this 

 has been done, the children will have collected minnows 

 from ponds and streams where they are abundant in order 

 to stock such pools as are suitable but do not contain 

 fish. Mud puddles and all pools too filthy or temporary 

 for fish to live in should be drained, and where this is not 

 immediately possible, they may be 

 covered with kerosene at the rate 

 of an ounce to fifteen square feet 

 of surface. 



Mosquitoes and Malaria. Annoy- 

 ance and suffering caused by 

 mosquitoes should be sufficient to 

 supply motives for this work. Still 

 another series of lessons for pupils 

 of sufficient advancement will serve 

 FIG. 24. EGGS OF MALARIAL to increase interest in the subject, 

 MOSQUITO especially in districts afflicted with 



As they appaar resting natu- 

 rally on the surface of the malaria. 



water. (Enlarged. After Begin by asking the pupils how 

 many have had malaria within a 



year. How did they enjoy it ? Next they may be asked 

 to tell how many cases they have known in the neighbor- 

 hood. Let them describe how the different cases are 

 distributed with reference to swamps and stagnant water. 

 It might be well to ask them to tell how they suppose 

 people get malaria and leave them to think over this 

 question until the next lesson. 



