Headden — Silicic Acid in Mountain Streams. 



181 



Analysis of Felspar used in Experiments. 



SiO, - 65-760 



SO3 -. .-. 0-003 



P,0, ._ 0-040 



CI*. 



Al,03 19-291 



Fe^Og trace 



CaO 0-314 



SrO _ trace 



BaO , none 



MgO 0-029 



Mn^O^ 0-061 



K^O 11-592 



Na,0 2-728 



Li„0 trace 



99-811 



The residue obtained from the first experiment with this 

 felspar showed the following composition : 



Analysis of Residue — First Experiment with Felspar 



Analytical 

 results. 



SiO, 



.S03t 



CO, 



CI- . 



Per cent. 



40-724 

 9-879 

 5-473 

 3-170 

 2-704 

 0-311 



10-241 

 trace 

 0-771 



10-972 

 5-249 

 trace 



16-366 



Combined. 



CaSO, __.. 



CaCO, 



MgC03..... 



KCO 



Per cent. 



16-801 



5-921 



1-611 



6-380 



Al 



KCl .\. 



KSiO 



6-667 



Fe - 



3-950 



Cab'. 



SrO 



Na,Si03 .._ 



Al 0, 



10-354 

 2-704 



MgO _ 



KO -_ 



FeO 



0-311 



SrOA. 



trace 



Na 



Li 



trace 



Li 



Ignition 



Sum 



Excess of SiO, .. 



Less CO^ expelled 

 Total 



16-366 



Igmtion 





. 71-065 



34-075 



Sum 



LessCO, + 0=Cl 



105-860 



6-187 



105-140 

 5-473 



. 99-667 



Total 



. 99-673 



* The chlorin was not tested for in the felspar, but the aqueous extract 

 shows it abundantly, and as the P2O5 probably exists as apatite the presence 

 of some chlorin would be accounted for if it were a chloro-apatite. Fluorin 

 was not tested for. 



f The SO3 and CI were not determined in this residue. These determina- 

 tions are taken from the other residues. 



