ELISHA MITCHELL SCIENTIFIC SOCIETY. 49 



more is present. Dr. Frankland mentions a case of zinc poisoning 

 where well-water, containing much dissolved oxygen and but little 

 •carbonic acid, was used after passing tlirougli galvanized iron pipes. 

 Prof. Heaton has recorded the analysis of a spring water in Wales, 

 and a second analysis of the same water after pas ing through half 

 a mile of galvanized iron pipe, showing that the water had taken 

 up 6.41 grains of zinc carbonate per gallon. 



A similar instance of zinc impregnated water has come under my 

 own observation, and I append the analytical results. The water 

 from a spring 200 yards distant was brought by galvanized iron pipes 

 to a dwelling house and thera stored in a zinc lined tank which was 

 painted with white lead. The water became somewhat turbid and 

 jnetallic-tasting and its use for drinking purposes was discontinued. 

 Analyses were made after the pipes had been in use about one year. 

 A somewhat full analysis of the spring water was made under my 

 direction by Mr. J. C. Roberts. The analyses of water from the 

 tank and directly from the pipe, I (tarried out only so far as zinc, 

 iron, and tests for lead were concerned. The results are calculated 

 in grains per gallon of 231 cu. in. : 



ANALYSIS OF SPRING. 



Silica . .2.45 grains. 



Lime.. • .23 



Magnesia.. .17 



Alkalies .43 



Chlorine .35 



Sulphuric acid _ .19 



Carbon dioxide (calculated) .45 



Total residue on evaporation . — 4.34 



The tank contained 4.48 grains of zinc carbonate per gallon with 

 a trace of iron and no lead. Water from the pipe gave 4.29 grains 

 of zinc carbonate per gallon and a trace of iron. 



It is evident then, when the dangerous nature of zinc as a poison 

 is taken into consideration, that the use of zinc-coated vessels in 

 connection with water or any food-liquid should be avoided. 



.7 



