1895.] 



PUBLIC DCXUMENT — No. 33. 



415 



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 " AVater 

 Analyses," by J. A. Wancklyn and E. T. Chapman.) 



Mr. "VYancklyn'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 allniminoid ammonia in water, without 

 chlorine, indicates a vegetable source of contamination. 



3. More than five grains per gallon* of chlorine (=71.4 

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

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

 of allnmiinoid 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 nmch chlorine. 



5. Albuminoid ammonia, over .15 parts per million, 

 ought to absolutely condemn a water which contains it. 



6. The total solids found in the water should not exceed 

 forty grains per gallon (571.4 parts per million). 



* One gallon equals 70,000 grains. 



