NORTH-CAKOLINA GEOLOGICAL SURVEY. 



13 



ground pea, though it is possible their constitution may not 

 be fully adapted to that crop, yet so far as the proportion of 

 sand is concerned it is not in excess. This fact is stated for 

 the purpose of alluding to what may not be known to many, 

 that a soil which is really poor and unsuitable for one crop, 

 may be well suited to another. The quality of the crop may 

 be much better when grown upon a soil where sand is in 

 great excess than upon a rich and well proportioned soil. 



9. The contrast between soils, one of which is not well 

 proportioned, while the other is, is strikingly exemplified in 

 the composition of another soil from Halifax county. Thus, 

 I found: 



Silex, 74.80 



Water, 21.90 



Organic matter, 5.40 



Alumina and per oxide of iron, 14.00 



Phosphoric acid, 01 



Lime, 40 



Magneisa, 20 



Potash, 05 



Soda, 03 



Another from Halifax county resembles very closely the 

 former ; thus, I found on submitting it to analysis : 



Silex, 94.15 



Water, 1.30 



Organic matter, * 1.35 



Oxide iron and alumina, 1.80 



Lime, 15 



Magneisa, 01 



Potash, 01 



Soda, 01 



Another soil from Halifax which had been long under cul- 

 tivation, but whose composition is somewhat better; thus, it 

 contained: 



Silex, 92.56 



Water, 1.20 



Organic matter, 2.70 



Oxide iron and alumina, 2.70 



Lime, 18 



