118 



Mr. H. M. Witt on the Variations in the 



Table II. — Average Composition of the Thames Water at 

 Kingston for the year. 



But (luring a part of the time the analyses were repeated more 

 frequently ; in fact, during a period of about a month no less 

 than seven analyses were made, which are exceedingly interest- 

 ing, as showing to what extent the chemical composition may 

 vary during that short space of time. 



Table III. — Analyses of the Thames Water at Kingston, be, 



tween January 21 and February 27, 1856. 



(Direct experimental results.) 



"'jjgg^^', Jan 25. Jan. 28. 1 Feb. 4. Feb. 12. Feb. 20. Feb. 27 



Temperature of the water. 



43°-5F.t 44' 



Total impurity 



Suspended matter 



Organic matter 



Dissolved salts 



Chlorine 



Or Cbloride of sodium "1 



(common salt) J 



Hardness 



22-183 

 321 

 1052 



17-92 

 1-456 



2-399 

 ir-52 



23-521 

 3-419 

 J-112 



18-990 

 1-749 



2-882 

 lO°-8 



39^-5 I 35° 47° 

 In grains in the gallon. 



24-96 

 4-41 



ir-2 



25-81 

 8122 

 0-917 



21-772 

 0-845 



V392 



13*= 



23-533 

 3-820 

 0-553 



19-160 

 1-008 



1-66 

 13''15 



38°-5 



24-578 

 3-509 

 0-8906 



20-178 



13°-3 



43° 



22-22 



0-971 



1-420 

 3337 

 13°-5 



From which the following averages may be deduced : — 



Table IV. — Average Composition of the Thames Water at 

 Kingston (from January 21 to February 27, 1856). 



Maximum. Minimum. 



Totalimpurity 



Suspended matter 



Organic matter 



Dissolved salts «..«M«f 



Chlorine 



Or Chloride of sodium.. 

 Hardness 



Mean. 



In grains in the gallon of water. 



25'81 

 4-41 

 1-112 



20-288 

 1-749 

 2-882 

 13°-5 



22-183 

 3-112 

 0-533 



18-518 

 0-845 

 1-392 

 10°-8 



23-99 

 3-761 

 1-665 



19-403 

 2-594 

 2-137 

 12°-5 



