t>* NORTH-CAROLINA GEOLOGICAL SURVEY. 



The leaves of forest trees are richer in the phosphates than 

 the bark or wood. 



In the fruit these elements exist in still greater proportion. 

 In the leaves of the Catawba grape I found them to exist in 

 the following proportions : 



Potash, 13.394 



Soda, 9.698 



Phosphates of lime and magnesia, 32.950 



Lime, 4.391 



Magnesia, 1.740 



Chlorine 0.740 



Sulphuric acid, 2.620 



Silica, 29.650 



Carbonic acid, :. 3.050 



99.026 



The fruit of the common black butternut is composed of 



BIND. SHELL. 



Potash 41.43 47.00 



Soda, 7.12 10.21 



Earthy phosphates, 15.60 18.50 



Lime, 23.75 5.60 



Magnesia, 1.55 0.10 



Chlorine, 1.50 2.15 



Silica, 1.36 0.40 



Sulphuric acid, 2.65 9,84 



Org'ic matter and alkaline phosphates, 2.30 5.40 



37. The oat plant furnishes similar facts. The dry crop 

 in the grain weighs 975 Ibs. per acre, and furnishes 39 Ibs. of 

 ash, with a percentage of 4.00. The elements, per acre, 

 are: 



Phosphoric acid, 6.00 



Sulphuric acid, 0.40 



Chlorine, 0.20 



Lime, .. 12.00 



Magnesia, 7 3.00 



Potash and soda, 5.00 



Silica, 21.00 



Oxide of iron, 60 



