ANALYSIS. 241 



Soluble Silica 32.4 



Insoluble Silica and Sand 19.8 



Sulphuric Acid 6 



Phosphoric Acid 1.3 



"Water 8.0 



Carbonic Acid, etc 3. 8 



100.0 

 This is an average of three analyses copied from Prof. Geo. H, Cook's 

 report of the Geology of New Jersey. According to this estimate 

 one ton (2000 lbs.) of Green Sand Marl contains — 



Lime 106 lb& 



Magnesia 32 " 



Potash 96 " 



Soluble Silicic Acid 648 " 



Sulphuric Acid 12 " 



Phosphoric Acid 26 " 



(Equal to Phosphate of Lime 56^ lbs.) 



For the analysis of fertile and barren soils, see page 63. 

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