:08 



INDEX. 



Silex. as an acid in simple minerals, 

 Silica, combining weight of, 



" soluble, .... 

 Silicates, .... 



" decomposition of, 



" action of, carbonic acid on, 



" selected by plants, 



" constant in plants, . 



" no action on each other. 



" of soil, stationary, . 



" of potash, 



" action of oxygen on, 



" of soda in spent ashes, 



" unlimited fertility of, 



" uniformity of, . 



" laws of combination of, 

 Silicon, ..... 



" action of, with oxygen, 



*' sulphuret of, . 



" properties of, 

 Silicic acid, .... 

 Siliciurets, .... 



'* action of air on, 

 Sinclair, Sir John, on sea water, and peat. 

 Skin of the sole of the foot, an analysis of, 

 Slate, .... 



Snow, salts in, . 



Soda, .... 



" silicate of, ... 



" silicate of, combining weight of, 

 " may take the place of lime, 

 " muriate of, action of, . 



Soil, 



only one, 

 all primary, 

 transportation of, 

 chemical composition of, 

 analysis of, 

 bulk of. . 



40, 



41. 



77, 



sEcnox. 

 59 



70* 

 46,76 

 76 

 131, 134, 285 



42, 45, 



48 



