218 



ON THE CHEMICAL CONSTITUENTS OF SOILS. 



Magnesia, with silicate of potash, &c. . 0'730 



Potash 0-066 



Soda 0-010 



Phosphoric acid 0*367 



Sulphuric acid (in gypsum) . . , a trace 



Chlorine (in common salt) . . O-lOO 



Humus and azotized matter . . . 0900 



Loss 0-140 



(B) 

 0-340 

 0-304 

 a trace 

 0-122 

 0010 

 0004 



0-228 



100-000 100000 



The analysis of this soil shows, that, with the ex- 

 ception of gypsum, every ingredient is present 

 which is requisite for the nourishment of leguminous 

 plants. Hence it is that gypsum exerts such a 

 favorable influence upon it. 



3. Surface-soil (A) a strong loamy sand, 

 Brunswick. (B) the analysis of the subsoil, 

 parts contain : — 



from 

 100 



Silica, with coarse siliceous sand . 

 Alumina ..... 



Peroxide and protoxide of iron 



Peroxide of manganese 



Lime ...... 



Magnesia .... 



Potash and soda, the greatest part in 



combination with silica 

 Phosphate of iron 

 Sulphuric acid (in gypsum) . 

 Chlorine (in common salt) 

 Humus 



(A) 



95-698 

 0-504 

 2-496 



a trace 

 0038 

 0-147 



0-090 

 0164 

 0007 

 0-010 

 0-846 



(B) 



96-880 

 0-890 

 1-496 



a trace 

 0019 

 0-260 



0-079 



0-110 



a trace 



a trace 



0-226 



100000 100000 



This soil was much improved by manuring with 

 lime and ashes. It was then found well fitted for 

 clover, beans, and peas. 



4. Surface-soil (A) a loamy sand, from the envi- 

 rons of Brunswick. (B) analysis of the subsoil at 

 the depth of 3 feet. 100 parts contain : — 



(A) (B) 

 Silica and fine siliceous sand . . 94-724 97 340 

 Alumina . . . . 1-638 0-806 

 Protoxide and peroxide of iron with man- 

 ganese ..... 1-960 1201 



Lime 1-028 0-296 



Magnesia . . . .a trace 0095 



Potash and soda . . . 0077 0-112 



Phosphoric acid .... 0024 0-015 



Gypsum .... 0.010 a trace 



