1891.] 



PUBLIC DOCUMENT — No. 33. 



279 



Analyses of Water — Concluded. 



The analyses have been made according to Wancklyn's 

 process, familiar to chemists, and are directed towards the 

 indication of the presence of chlorine, free and albuminoid 

 ammonia, and the poisonous metals, lead in particular. 

 (For a more detailed description of this method, see 

 *' Water Analyses," by J. A. Wancklyn and E. T. 

 Chapman.) 



Mr. Wancklyn's interpretation of the results of his mode 

 of investigation is as follows : — 



1. Chlorine alone does not necessarily indicate the 

 presence of filthy water. 



2. Free and albuminoid ammonia in water, without 

 chlorine, indicates a vegetable source of contamination. 



3. More than five grains per gallon* of chlorine (=.71 A 

 parts per million), accompanied by more than .08 parts per 

 million of free ammonia and more than .10 parts per million 

 of albuminoid ammonia, is a clear indication that the water 

 is contaminated with sewage, decaying animal matter, urine, 

 etc., and should be condemned. 



4. Eight-hundredths parts per million of free ammonia 

 and one-tenth part per million of albuminoid ammonia 

 render a water very suspicious, even without much chlorine. 



* One gallon equals 70,000 grains. 



