216 T. S. Hunt on the Chemical and Mineralogical 
cates and earthy carbonates is seen in the large amounts of car 
bonate of soda, with but little silica, which infiltrating waters — 
constantly remove from argillaceous strata; thus giving rise to 
alkaline Springs, and to natron lakes, In these waters it will be 
found that greatly predominates, sometimes almost to the 
exclusion of potash. ‘This is due not only to the fact that soda 
feldspars are more readily d 1 than orthoclase, but to the 
Bh ie ie bs war 
y es nower yg sil re 
well known power of arg . toa * 
ter the potash salts which it already holds in solution. Thus — 
