366 Prof. Bischoft" on the Temperature of 



silica, 0,03482 ; alumina, 0,00950 ; sulphate of soda, 0,07345 ; 

 sulphate of lime with water of crystallisation, 0,30711 ; sulphate 

 of magnesia, 0,14881 ; oxide of iron, a trace; organic matter, a 

 traue ; = 0,99795 : Loss, 0,03102 ; = 1,02897. 



No fluates, phosphates, nor strontian, could be found. Mr 

 Pagenstecher had the goodness at the same time to undertake the 

 analysis of the waters of the Aar and the Rhine. The former 

 was taken from the middle of the stream near Bern, when the 

 weather was fine and the water perfectly clear ; and after twenty- 

 four hours not the slightest trace of a sediment was to be per- 

 ceived. 



The Rhine water was taken near Basel, at some distance from 

 the bank, also at a time when the river was perfectly clear. In 

 the bottles in which it was sent there was no sediment, and the 

 water was clear and colourless. 



The analysis gave the following result. 



Carbonate of Lime, 

 Carbonate of Magnesia, 



Silica, 



Sulphate of Soda, 



Sulphate of Lime, with water of 



crystallisation, 

 Sulphate of Magnesia, 

 Chloride of Sodium, 

 Chloride of Potassium, 

 Alumina and Oxide of Iron, 

 Organic matter, 



Loss, 



2,21774 



1,71127 



If we compare the analyses of these three waters, we find a 

 very near resemblance in their component parts: the only differ- 

 ence being, that in the Lutschine the chlorides are wanting which 

 are found, althougli in but small quantities in both of the others. 

 They do not, however, correspond so nearly in the quantities of 

 the various parth ; on the contrary, the difference is here very 

 great, for the Lutschine is distinguished by its far greater purity, 

 that is to say, by its comparatively small contents of fixed sub- 



