120 



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



Before boiling . . 12°-62 

 After boiling . . 9°00 

 Loss by boiling . 3°-62 

 The water being so much more impure here than at Kingston, 

 the variations in composition during the year are more consi- 

 derable/ as shown by the following comparison of four analyses, 

 made in June, October, and December 1855, and in May 1856. 



Table V. — Analyses of the Thames Water at Chelsea during 



the year between May 1855 and May 1856. 



(Direct experimental results.) 



June 14, 

 1855. 



September 12, 

 • 1855. 



December 29g 

 1855. 



May 10, 

 1856. 



Temperature of the water. 



62°-5 F. 61° F, 



In grains in the gallon of water 



Total impurity , 



Suspended matter : — 



Organic 



Inorganic 



Dissolved matter : — 



Organic 



Inorganic 



Chlorine 



Sulphuric acid 



Lime 



Magnesia '. 



Hardness : — 



Before boiling 



After boiling 



Loss by boiling 



64146 



11-247 

 28-930 



1-349 

 22-620 

 1-956 

 3-073 

 8-719 

 1-189 



13-5 

 9-3 

 4-2 



