MONOCELLULAR ANIMALS-THE PROTOZOA 



133 



Fig. 7-26. Some ciliates are voracious carnivores. Dicfinium, for example, is able to engulf a Paramecium much 



larger than itself. 



The treatment for malaria has an in- 

 teresting history. About 1640 a countess 

 visiting in Peru became ill with malaria and 

 when given extracts from the bark of a tree, 

 since named cinchona in her honor, she re- 

 covered. She was so impressed with the 

 drug that she brought some back to Europe 



where it was shown to be extremely effec- 

 tive in the treatment of malaria. From that 

 time to the present quinine, the effective 

 drug in cinchona bark, has been used as a 

 specific treatment for malaria. It has prob- 

 ably saved more lives and relieved more 

 suffering than any other drug ever discov- 



Pedepbt^rq 



Stintor Stylonicbia T«+t*obyi»)«oo Caixbcsium 



Fig. 7-27. Various types of fresh-water ciliates. 



