244 



ON THE CHEMICAL CONSTITUENTS OF SOILS. 



Siliceous sand .... 



Silica ..... 



Alumina ..... 



Phosphates of lime and iron 



Carbonate of lime .... 



Carbonate of magnesia 



Insoluble extractive matter 



Insoluble extractive matter destructible by heat 



Animal matter .... 



Resin ..... 



Loss ..... 



57900 

 14-500 

 2-000 

 6000 

 11-100 

 1-000 

 1-250 

 4-000 

 1-600 

 0250 

 0400 



100-000 



This great chemist has strangely omitted to detect 

 in the soil potash, soda, chlorine, sulphuric acid, and 

 manganese. As this soil is eminent for its fertility, 

 there cannot be the slightest doubt that all these 

 ingredients must have existed in it in notable quan- 

 tity. 



ISLAND OF JAVA. 



44. A very fine-grained loamy soil, colored yellow 

 by peroxide of iron, consisted of; 



Silica and siliceous sand 



Alumina 



Peroxide and protoxide of iron 



Peroxide of manganese 



Lime .... 



Magnesia 



Potash, principally in combination with silica 



Soda, idem 



Phosphoric acid 



Sulphuric acid 



Chlorine 



Humus 



Water, with carbonic acid 



100-000 



WEST INDIES (pORTO RICO). 



45. Surface-soil of a very barren field. 100 parts 

 contained : — 



