

HORTUS GRAMINEUS WOBURNENSIS. 121 



Brought forward 198 



Vegetable matter - 18 

 Silica - 110 

 Alumina - - 58 

 Oxide of iron 7 

 Soluble vegetable and saline matters, prin- 

 cipally sulphate of magnesia 5 

 Loss - 4 



400 



VIII. Tenacious Clay. 



400 grains, deprived of moisture, consisted of 



Fine sand - - 159 grains. 



Vegetable matter - 10 



Carbonate of lime - 25 



Carbonate of magnesia 2 



Silica - 111 



Alumina - 55 



Oxide of iron 8 



Soluble saline matter, chiefly sulphate of 



lime, and a little sulphate of magnesia - 11 



Loss - 19 



400 



IX. Rich Alluvial Soil, par tit/ formed by the Deposition of flow- 

 ing Water. 

 400 grains, deprived of moisture, gave of 



Fine sand - 115 grains. 



Aluminous stones - 70 



Carbonate of lime - 23 



Decomposing vegetable and animal matter 34 



Silica - 100 



Alumina - 28 



Oxide of iron - 13 



Sulphate of lime or gypsum 2 

 Soluble vegetable and saline matters 



Loss 8 



400 



06s. Of all the soils employed in the experiments, this one was 

 the most productive : it was upon a porous subsoil : all the supe- 



