246 



INTRODUCTION TO GENERAL SCIENCE 



179. THE STINGS OF INSECTS 



The pain caused by stings is due chiefly to formic add or 

 to some irritant which is injected; that is, the effect is chem- 

 ical. Ammonia, since it neutralizes an acid, is good to allay 

 the pain. 



There is a secondary effect, however, for which the insects 

 are not responsible, and which is due to the bacteria or pro- 

 tozoa which they inject at the time they sting. Yellow fever 

 and malaria are caused only by the bite of a certain kind of 

 mosquito which injects protozoa. Similarly, the " sleeping 

 sickness " is due to another species of protozoa which is 

 injected by the bite of a fly, similar to the tsetse fly. 



We can reduce the number of mosquitoes and finally exter- 

 minate them from a given locality by preventing the growth 

 of their larvae, commonly called " wigglers." This can be 

 accomplished by pouring crude oil upon the surface of the 

 water where they swarm. 



References : 



1. 1304:170. 



2. 1501 : 154. 



3. 1503 : 185-186. 



4. 1901:214-220. 



5. Farmers' Bulletin 



Rural Districts 

 a. 1308 : 143-145. 

 6, 1505:160-161. 



c. 1506:269. 



d. 1507 : 132-135. 



e. 1509 : 189. 



/. 1904:103-109. 

 g. 1904:110-116. 



Swamps and Malaria. 

 Insects' Stings and Bites. 

 Mosquitoes and Flies Transmit Disease. 

 Malaria and Yellow Fever Mosquitoes. 

 No. 155. How Insects Affect Health in 



Man's Enemies. 



Mosquito Fevers. 



Malaria from Mosquito Bites. 



Malaria and Mosquitoe?. 



Malaria and Mosquitoes. 



Malarial Fever and Yellow Fever. 



Mosquitoes and their Control. 



