WATER 119 



City Bacteriologist concerning the condition of the 

 city's water? 



18. When camping or traveling in the country, it is 

 unwise to drink from a spring or well. To make sure 

 that the water is safe to drink, follow the method of 

 purifying the drinking Avater given by Dr. W. A. 

 Evans (See page 117). 



19. Name two substances which will dissolve in 

 water. 



20. Why does water in streams look muddy after 

 rains or heavy winds? 



21. Why are river bottoms usually very fertile? 



22. Do we obtain water from our solid foods? Give 

 examples. 



