[ 64 ] 



and other rivers, which bear no comparison to the Indo- 

 Gangetic alluvium. (6; The soil covering the Dharwar 

 (C. P.) rocks are also quite different from the red soils of 

 the metamorphic rocks of the Madras Presidency. Soils of 

 other kinds also occur in smaller patches, but the main types 

 of Indian soils are four. 



69. The soils of the Indo-Gangetic alluvium are generally 

 of fine texture, containing no pebbles, and the only particles 

 larger than sand to be met with in the alluvium consist of 

 Kankar, deposited within a few feet of the surface. The 

 character varies within certain limits. In most places the 

 alluvium is yellow loam. In some places it is sandy, and in 

 others clayey. The clay is generally bluish grey. Occasion- 

 ally also sand duns or hills have been formed by the wind. 



70. The following tables furnish the analyses by Dr. 

 Leather of the principal Indo-Gangetic alluvium soils. 



/. Sandy soil from I son sand belt near Cawnpore. 



Insoluble Silicates and Sand ... ... ... 9172 / c 



Fe 2 3 ... 2 36 



A1 2 O 3 .- ... ... ... 2-92 



CaO ... ... ... ... 35 



MgO ... 78 



K 2 ... ... ... ... -33 



Na 2 O ... ... ... ... -08 



P 2 O 5 ... ... ... ... -08 



SO 3 ... -04 



C0 2 ... ... ... -27 



* Organic matter and combined water ... ... 1*07 ,, 



lOO'OO 



027/ of Nitrogen. 



