42 GENERAL SCIENCE 



celery and cabbage, should be washed until any danger of 

 disease germs from the soil, the air, or from dust is unlikely. 

 It seems wholly reasonable to believe the statements that 

 more than one-half the sickness, and of the wretchedness 

 caused by sickness, is produced by disease germs. Much of 

 this terrible waste can be avoided by enlightened action 

 on the part of individuals and communities. Many of the 

 worst diseases that afflict mankind would speedily be brought 



FIG. 1 6. Danger of infection. Why not walk? 



under control, and perhaps would disappear, if the scattering 

 of disease germs through carelessness and ignorance could 

 be prevented. It is to be remembered always that disease 

 germs come from sick people or sick animals, and that to pre- 

 vent the dissemination of these germs is to wipe out the 

 disease. 



Instruction in schools has an important part in this 

 warfare upon disease. Attention to one's own health 

 as result of studies in hygiene, and care given the health 



