GENERAL SCIENCE 



fruit juices. In order to protect his property, man had 

 to find ways of preventing the growth of these tiny 

 plants called yeast, mold, and bacteria. A few bacteria 

 and one-celled animals live as parasites in man when 

 they get a chance, and are called disease germs. Each 

 kind causes a different disease. 



TYPES OF GERMS 



From left to right, top row: Pus, Tuberculosis, Tetanus; bottom row: 

 Pneumonia, Diphtheria, Typhoid. 



Many physicians are spending their lives in studying 

 disease germs, and some wonderful results have been 

 accomplished. These physicians tell us that it is much 

 easier to prevent disease than it is to cure it. When 

 the germs get into our bodies, they are very hard to kill 

 without injuring the body. Some germs the physicians 

 are not yet able to kill while they are in the human body, 

 and the diseases caused by such germs are said to be 

 incurable. What are some incurable diseases? 



The air contains many of these dangerous germs be- 



