AGRICULTURAL GEOLOGY. 193 



alluvial, are confined to the banks of streams, and arc necessarily 

 narrow, in fact mere lines. It is extremely rare that intervale land 

 extends a mile from the banks of the river on which it is situated : 

 this is even true of the Champlain and Hudson vallies. 



Analyses of soils. 

 1. We select one from Columbia county : it is of a light gray, 

 md was taken from a field of corn in Chatham 4- corners. The corn 

 n&s in a flourishing condition, and had been lightly manured with 

 table manure. The soil was composed of 



Water ' . . 500 



Vegetable matter 6-00 



Silex 78-50 



Peroxide of iron 625 



Alumina 350 



Carbonate of lime - - . . 066 



Phosphate of magnesia • - . 0*16 



10007 



2. A specimen of soil from over an impure limestone in Hoosic 

 alls : texture coarse, with angular grains, reddish and uncultivated. 



Vegetable matter 5-00 



Water 3.O0 



Silex 78.00 



Peroxide of iron 8'50 



Alumina ----... 4.00 



Carbonate of lime .... 1-40 



Phosphate of magnesia - - . 0-10 



100-00 



3. A soil from Sheffield, on the eastern side of the Taconic range, 

 nalyzed by Pres. Hitchcock, by the alkaline method ; the result,' 

 owever, does not differ in the main from that given by the acid 

 lethod. 



Water 200 



Vegetable Matter 2-00 



Silica 70-68 



Alumina -----.. 11-61 



Oxide of iron lO'lO 



Lime - -• 0-80 



Magnesia 1-63 



Soluble salts 0'15 



Loss 103 



100-02 



