EXERCISE. Catch some of the mosquito wigglers which you may 

 find in standing water and keep them in a glass partly filled with water, 

 under a lantern globe covered with cheese cloth. Watch the habits of 

 the larvae and pupae. If you can find any of the boat-shaped egg 

 masses of the common house mosquito or the single eggs of the malarial 

 mosquito, put them into a tumbler of water by themselves and watch 

 them until they become full-grown mosquitoes. 



FIG. 178. MOSQUITO THAT CARRIES THE YELLOW FEVER GERM 



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