34 



AGRICULTURAL TEXT-BOOK. 



SOLCBLE IN 

 W.4THR. 



A.2.470prct 

 B. 0.147 &quot; 



These are very rich soils, and derive their origin from the 

 country, and are the product of decayed rocks. 



113. II. Cotton Lands of Mississippi. (J. P. Norton,} 



A. 

 Organic matter, - - 4.740 



Silica, - - 1.299 



Iron, alumina, and phosphates, 0.230 



Lime, - ... 0.389 



Magnesia, ... 0.090 



Manganese, - - C.034 



Potash, 0.248 



Chloride of sodium, (common salt,) 0.107 

 Soda, .... 

 ^ Sulphuric acid, .. 



Silica, .... 



Alumina, - .. 



Iron, .... 

 Lime, ... 



Magnesia, ... 



Manganese, .. 



Potash, 



Soda, 



Sulphuric acid, 



Phosphoric acid, .. 



SOLUBLE n 



ACID. 



A 4.96 pr ct. 

 B.5.19 &quot; 



LNSOLCBLB 

 PORTION. 



r Silica, - 



Iron and alumina, 

 j Lime, - 

 A.87.83prct. Magnesia, - 

 B 88.373 &quot; |^ Manganese, 



100.059 



Rhine 



B. 



6. &quot;290 

 0.072 

 0.019 

 0.020 

 none 

 none 

 0.120 



89.867 



A. is from a strong cotton soil. B. was originally the samo soil, hut 

 has been worn out by long cultivation. This analysis is peculiarly val 

 uable as an illustration. The first table gives the organic elements 

 soluble in water, and which alone are available for the growth of the 

 plant. In the new soil this amounts to about 2*- per cent, of the 

 whole. In the worn out soil, it is very trifling. A plant grown in the 

 latter would be nearly starved ; while it would be entirely deficient in 

 two elements of nutrition. The second table gives the inorganic ele 

 ments soluble in acid, but not in water. While, therefore, these are not 



