*0 NORTH-CAROLINA GEOLOGICAL SURVEY. 



Potash, 78 " 



Soda, 30 " 



Chlorine, 29 " 



Sulphuric acid, 34 " 



507 



If five* hundred pounds of the earthy constituents of this 

 soil are removed from one acre in one year or in a single 

 crop, it will amount in one hundred years to fifty thousand 

 pounds a quantity which would exhaust most perfectly any 

 of the ordinary soils of the country. 



In an analysis which I have made of the kernels and cobs 

 of the yellow corn, I found : 



COBS. 



Silica, 4.67 5.93 



Earthy phosphates, 8.22 22.18 



Lime, 0.10 0.10 



Magneisa, 30 1 .50 



Potash, 12.31 14.95 



Soda, 2.03 14.11 



Chlorine, 0.04 0.39 



Sulphuric acid, 0.11 2.74 



61.81 



That the composition of the leaves may be compared with 

 the foregoing, I subjoin an analysis of the leaves made at the 

 same time and growing upon the same plant: 



LEAVES. 



Silica, 82.88 



Earthy phosphates, 29.27 



Lime, 9.40 



Magneisa, 1.91 



Potash, 19.70 



Soda, 13.14 



Chlorine, 15.07 



Sulphuric acid, 6.46 



It might be supposed that as the sheaths of the leaves be- 

 long in one sense to the leaves themselves, that their composi- 

 tion would be the same ; but this is not the case as may be 

 seen by the following analysis : 



