344 Professors Kirchhoff and Bunsen on Chemical 



Or 100 parts of the mixed chlorides contain — 

 Chloride of caesium . . . 3013 

 Chloride of rubidium . . 69-87 

 10000 

 Taking a mean of all these experiments, we find that the 

 mother-liquor from 44,200 kilogrammes of the Durkheim water 

 yielded altogether — 



9*237 grms. of chloride of rubidium, 

 7*272 grms. of chloride of caesium. 

 These determinations do not, of course, profess to be very ac- 

 curate. The numbers thus obtained are, however, correct enough 

 for us to be able to give an approximate value for the quan- 

 tity of the rubidium and caesium compounds contained in the 

 Durkheim mineral water. The following numbers express the 

 composition of 1000 parts of this remarkable mineral water, ac- 

 cording to analyses made in the Heidelberg laboratory : — 



Mineral Water of Durkheim. 



Bicarbonate of calcium 0*28350 



Bicarbonate of magnesium .... 0-01460 



Ferrous-bicarbonate 0-00840 



Manganous-bicarbonate .... trace 



Chloride of calcium 3-03100 



Chloride of magnesium 0*39870 



Chloride of strontium 0*00810 



Sulphate of strontium 0*01950 



Chloride of sodium ' 12*71000 



Chloride of potassium 0*09660 



Bromide of potassium 0*02220 



Chloride of lithium 0*03910 



Chloride of rubidium 000021 



Chloride of caesium 0-00017 



Alumina 0*00020 



Silica 0*00040 



Free carbonic acid 1*64300 



Nitrogen 0*00460 



Traces of sulphuretted hydrogen . . 0*00000 



Traces of phosphates 000000 



Traces of ammoniacal salts .... 0*00000 



Traces of indeterminate organic bodies. 000000 



18*28028 

 The mother-liquors obtained from the Diirkheim salt-works, 

 and sold for the purpose of manufacturing brine-baths, were found 

 to contain the new alkaline chlorides in a more concentrated form, 

 as is seen from the following analysis : — 



