252 



ANNUAL REPORT OF THE 



Off. Doc. 



Sandstone. 





Water and organic matter, 



Silica, sand 



Alumina, clay 



Alkalies, potash 



10.9 



73.0 



9.1 



2.7 



Sedentary limestone soils, on the otlier hand, manifest a great 

 change by the solution and disapi)earance of their soluble lime-car- 

 bonate which is reduced from 78 per cent, nearly 2 per cent., while 

 the insoluble silica accumulates until the original 5.1 becomes 65 

 per cent., and the soluble silica increases from 1 per cent, to nearly 

 12 per cent. 



Limestone. 



J2 



Water and organic matter. 

 Insoluble silica, sand, ... 



Soluble silica, 



Insoluble alumina 



Soluble alumina 



Calcium, carbonate, lime. 

 Potash, alkalies 



8.9 



65.5 

 11.7 

 1.3 

 7.9 

 2.7 

 1.5 



