260 



Mr. A. B. Northcote on the Water of 



Severn Water of 1867. 

 Table of Constituents calculated in 1000 parts of the Water. 





Water from above Water from Bailey's 

 Hawford Brook. Fer 





February 14,1867 





I. 



II. 



Mean. 



I. 



II. 



Mean. 



Dissolved matter : — 

 Potassa , 



•0058 

 •0109 



•0380 

 •0090 

 •0050 

 •0140 

 •0180 



•0075 

 •0109 



•0056 

 •0108 



•0379 

 •0088 

 •0049 

 •0141 

 •0181 



•0080 

 •0112 



•00570 

 •01085 

 trace 

 •03795 



•0068 

 •0200 



0393 



•0066 

 •0193 



•0385 

 •0095 

 •0086 

 0223 

 0180 



•0086 

 •0119 



•0067 

 •0197 

 trace 

 •0389 

 •0095 

 •0082 

 •0220 

 •0176 



undeter- 

 mined. 

 •0082 

 0125 



Soda 



Ammonia 



Magnesia 



•00890 



•0095 





•00495 -0078 

 •01405 -0217 



Chlorine 



Sulphuric anhydride 



Nitric ' „ 



Phosphoric ,, 



Carhonic „ 



Silicic „ 



•01805 



undeter- 

 mined. 



•00775 

 •01105 



0172 



•0079 

 •0132 





Residue obtained by direct \ 

 evaporation J 



•1439 



•1403 



•1421 



•1664 





•1664 



Suspended matter : — 

 Inorganic 



•0487 

 •0024 





•0487 

 •0024 



0431 

 0029 





0431 

 •0029 



Organic [loss on ignition], 



Specific gravity of the water. 



1000-127 



1000-183 



Height of river-level 

 Diglis lock 



at 1 



17 



feet 2 i 



n. 



17 feet 2 in. 









I have also determined the amount and composition of the pre- 

 cipitates formed upon concentrating the waters to about one- 

 sixth of their bulk ; they consist chiefly of carbonates, usually 

 with a little admixture of silica, probably' in the form of silicates. 

 The water was concentrated in a platinum dish, the precipitate 

 collected on a tared filter, the film adherent to the dish weighed', 

 and, after solution in chlorhydric acid, added to the similar solu- 

 tion of the precipitate for analysis. 



