708 



THE POPULAR SCIENCE MONTHLY. 



In it are discussed the impurities in drink- 

 ing-water that are oftenest the cause of dis- 

 ease and death, and the natural and artificial 

 processes of removing them. The author's 

 conclusions are the fruit of an experience 

 gained in the analysis and study of nearly a 

 thousand water-supplies, and are aided and 

 re-enforced by the studies and writings of 

 others. A definition of pure water, in a 

 potable rather than a chemical sense, is 

 sought in the first chapter. The inorganic, 

 the vegetable, and the animal constituents of 

 water, micro-organisms, water-supplies, natu- 

 ral and artificial purification, and central fil- 

 tration, are considered in the several suc- 

 ceeding chapters. Of analysis, only a few 

 elementary qualitative tests are mentioned, 

 the general subject being reserved for an- 

 other book, which is announced. The lan- 

 guage is such as can be easily understood by 

 every intelligent person. 



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