FORMATION OF SOILS. 



The portion Insc'.ub'e 



soluble in acids. residue. 



Silica - - - - 38 574 - - 66291 



Alumina- - 24*320 - - 16510 



Potash - 3079 - - 9*249 



Soda - 12-656 - - 4' 960 



Lime .... 1802 - - A trace. 



Peroxide of iron - - 11 '346 - - 2388 



Peroxide of manganese - 2*194 - - 0*896 

 Titanic acid - - - 0*620 

 Water .... 4*209 

 Organic substances - - 0*405 

 Jn a similar manner, Frick has analysed clay slate, and Lowe 

 the basalt and lava from Mount Etna. 



C 4*615 Magnetic Iron Ore. 

 Basalt contains in 100 parts < 39*800 Zeolite.* 

 ( 55*885 Augite.f 



By treating clay slate from Bendorf with muriatic acid, it was 

 decomposed into — 



26*46 parts soluble in muriatic acid. 

 73*54 parts insoluble in muriatic acid. 



The composition of these was as follows : — 



Soluble part Insoluble part 



of clay slate. of clay slate. 



Silica 22*39 - - - 7706 



Alumina 19*35 - - - 15*99 



Peroxide of iron 27*61 - - - 1*53 



Magnesia ------ 7*00 - - - 57 



Lime 2*42 - - - 3*94 



Potash without soda - - - - 2*37 - - 3*94 



Water, carbonic acid, and loss - - 18*86 - - - 0*39 



Oxide of copper ----- ..._o*19 



From these analyses we may deduce some highly important 

 results. 



It is known that felspar is unable to resist the solvent action 



* Zeolite contains — 



Silica ----- 38*83 



Alumina 28*77 



Lime 10*45 



Soda 13*81 



Potash 1*42 



Water 6*72 



f Augite is a silicate of lime and magnesia 



