NOTE ON THE LATEKITE OP ORISSA. 291 



The following were the- results of assays : 



per cent of iroiii 



At 4 feet the specimen (Laterite) taken contained ... ... 2453 



« 8 „ „ . „ (Lithomarge) „ „ 18-71 



„ 12 „ „ „ (ditto) „ „ 15-30 



,, 16 „ „ „ (ditto) „ „ 1611 



„ 20 „ „ „ (ditto) „ „ " ... lO'OO 



» 24 „ „ „ (ditto) „ „ .., 8-37 



WATER LEVEL. 



" 23 „ „ „ (clay) „ , 4-80 



» 32 „ „ „ (ditto) „ „ 4'08 



.. 36 „ „ „ (ditto) „ „ ■ 5-34 



.. 40 „ „ „ (clay) „ „ 3-83 



,, 48 „ „ „ (ditto) „ „ 4-47 



„ 57 „ „ „ (ditto) „ „ 7-16 



,. 64 „ „ „ (ditto) „ „ 5-63 



„ 70J „ „ „ (ditto) „ „ 5-67 



These assays shew a sudden change, and a diminution of nearly 6 per 

 cent, in the quantity of iron contained, between the laterite and the 

 lithomarge. Thence downwards, as far as the water level of the country, 

 there is with one exception, a perfectly uniform diminution in the quantity 

 of iron. And when it is considered that lithomarge is far from homo- 

 geneous in composition, and that it contains masses far more ferruginous 

 than the rest of the rock, a single exception to the regular diminution, if 

 surprising, is so only on account of its singularity. Neglecting therefore 

 the quantity of iron found at 16 feet, and dividing in proportion the 

 difference between 12 and 20 feet, we have the following decrements in 

 the percentage of iron from the surface to the water level. 



At 8feetfromthesurface(inlithomarge)thereis5'82percent less than at 4 feet (inlatei-ite.) 



, 12 „ 





)J »J 



( in ditto ) 



» 



„ 3'41 per cent 



19 it 



„ 8 



„ (in lithomarge). 



) 16 ,j 



)> 



i) J) 



( in ditto ) 



a 



„ 2*94 per cent 



)» »J 



»12 



„ (in ditto). 



, 20 „ 





n ?) 



( in ditto ) 



J) 



„ 2'36 per cent 



') » 



,,16 



„ (in ditto). 



, 24 „ 





)» »' 



( in ditto ) 



)j 



„ 1*63 per cent 



5> J» 



„20 



„ (in ditto). 



,. 28 „ 





it » 



( in ditto ) 



„ 



„ 3'57 per cent 



)» t* 



,,24 



„ (in ditto). 



