262 



Mr. A. B. Northcote on the Water of 



Severn Water of 1857-58. 

 Table of Constituents calculated in 1000 parts of the Water 





Water taken in the neighbourhood of Bailey's Ferry. 



September 1, 1857. 



November 30, 1857. 



I. 



II. 



Mean. 



I. 



II. 



Mean. 



Dissolved matter : — 

 Soda 



•0724 

 •0214 



•0862 

 •0480 

 •1008 

 •0021 



•0282 



•oe'as 



•0184 

 •0903 

 •0502 

 ■1015 



•0323 



•0709 

 •0199 

 •0882 

 •0491 

 •1011 

 0021 

 •0302 



•0696 

 •0631 

 •0169 

 •0542 

 •0407 



•0036 

 ■0626 



•0641 

 •0590 

 •0158 

 •0512 



•0386 



•0042 

 •0542 



•0668 

 •0640 

 0163 

 •0542 

 •0396 



•0039 

 •0584 



Lime 



Magnesia 



Chlorine 



Sulphuric anhydride. 

 Carbonic anhydride . 

 Silica 



Loss on ignition 



Residue obtained by") 

 direct evaporation. J 



•3434 



•3476 



•3455 



•2902 



•2819 



•2860 



Height of river-level \ 

 at Diglis Lock ... J 



9 feet 5 inches. 



9 feet 11 inches. 





March 1, 1858. 



June 1, 1858. 



Dissolved matter : — 

 Soda 



•0840 

 •0621 

 •0157 

 •0738 

 •0494 



: 0041 

 •0367 



•0807 

 •0595 

 •0169 

 •0753 

 •0472 



•0375 



•0823 

 •0608 

 •0163 

 •0745 

 •0483 



•0041 

 •0371 



•0408 

 •0115 

 0345 

 •0249 



•0070 

 0235 



•0350 



•0408 

 •0115 

 •0347 

 •0249 



•0070 

 0235 



Lime 



Magnesia 





Sulphuric anhydride . 

 Carbonic anhydride .. 

 Silica i 



Loss on ignition 



Residue obtained byl 

 direct evaporation.. J 



•3193 



•3173 



•3183 



•1857 





•1857 



Height of river-level t 

 at Diglis Lock ... j 



9 feet 10 in. 



10 feet. 



vent salts are excluded, 1000 cub. centims. of water may yet 

 contain at least -136 grin, of calcic sulphate unprecipitated for 

 apparently any length of time in the presence of an atomic pro- 

 portional, or '106 grm. of disoclic carbonate; and with calcic 

 chloride the results are closely similar. Now, assuming com- 

 plete interchange of constituents to take place, '136 grm. of 

 calcic sulphate will give rise to *100 grm. of calcic carbonate; 

 and as 1000 cub. centims. of pure water dissolve only *035 

 grm. of the latter salt*, in the case in question a triple amount is 



* Weltzieu in Bulletin, 1866, l rc semestre, p. 353, confirms this result 

 obtained by Hofmann. 



