How to Purify Water— Add half a grain 

 of pure alum to each gallon of water. This 

 small quantity does not injure the water for 

 any purpose, and yet it will precipitate the 

 earthy and vegetable matters and with it the 

 bacteria that the water may contain, or at 

 least, so nearly clear the water that you need 

 not fear to drink it. 



