266 Mr. A. B. Northcote on the Water of 



Severn Water of 1866-67. 



Table showing the Composition of the dry Mineral Residues 

 of the Waters, calculated in 100 parts. 





April 12, 

 1866. 



July 23, 

 1866. 



Oct. 30, 

 1866. 



Above Haw- 

 ford Brook. 



Bailey's 

 Ferry. 



February 14, 1867. 



Chloride of sodium ... 

 Chloride of magnesium. 

 Soda 



32-49 



T<)5 

 200 



21-81 

 5-44 

 1-31 



11-50 

 4-42 



16-64 

 3-34 



40-27 



" : 40 



1-53 



19-87 



6-02 



•58 

 11-84 



•78 



16-37 



2-34 



22-89 



r im 



2-46 

 2402 



6-16 



100 

 13-91 



272 

 19-86 



432 



15-00 

 1-54 



"i : 20 



27-87 



5-89 



3-60 



1323 



23-01 

 5-66 



22-53 



" : 37 

 417 



24-21 

 5-91 

 510 



10-96 



21 65 



5-10 



Potassa 



Lime 



Magnesia 



Alumina &c 



Sulphuric anhydride ... 



Nitric anhydride 



Carhonic anhydride ... 

 Silicic anhydride 





100-00 



10000 



10000 



100-00 



10000 



mants, however, have kindly given me their observations for 

 several days preceding those on which my specimens were col- 

 lected ; and these will give some general idea of the state of the 

 river, so far as such observations, at present too widely scattered, 

 can lead to any conclusion. I particularly regret not having 

 been able to obtain more information with regard to the Welsh 

 rainfall, as it is obvious that the single set of observations at 

 Llanidloes can afford but a most imperfect indication of the in- 

 fluence of the Welsh water upon the river. The rainfall at 

 Llanidloes may give the state of the Hafren ; but it can afford no 

 clue to the condition of the Welsh tributaries, and especially of 

 the chief, the Banw and Vyrnwy, the sources of which are from 

 20 to 30 miles to the north, and which join the Severn about 55 

 miles below Llanidloes. Of the Shropshire rainfall I have a 

 more complete account : that of Oswestry swells the little river 

 Perry which falls into the Severn above Shrewsbury; and besides 

 that of Shrewsbury itself, I have obtained the rainfall of ShifF- 

 nal, which supplies the Worfe, a little river which also joins the 

 Severn ; but of the rainfall which is likely to influence the Tern, 

 its largest tributary in Shropshire, I have not been able to obtain 

 any observations. The rainfall of Wolverhampton I have con- 

 sidered to be indicative of the probable condition of the Stour, 

 and that of Bromsgrove of the Salwarp. In giving the following 

 Table, I would express my thanks to T. F. Roberts, Esq., Rev. 

 A. R. Lloyd, T. Howells, Esq., Rev. J. Brooke, H.Ward, Esq., 

 and G. Dipple, Esq., for their respective observations : — 



