HORTUS GRAMINEUS M^OBURNENSIS. 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, partly formed by the Deposition ofjloiving 



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 



Sihca - - - - - 100 



Alumina - - - - 28 



Oxide of iron - - - - 13 



Sulphate of lime or gypsum - - 2 



Soluble vegetable and saline matters - 7 



Loss - - 8 



400 



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

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



