688 Tnaxsactioxs of the Amebic an Institute. 



has been done in some analyses ; for I do not thhik tliey are the only 

 useful substances in it. Some have fine carbonic of lime of too much 

 value to be neglected. And tlie 6ul[)liateof lime (gypsum) in many 

 of them is enougli to bo very beneficial to crops. The question of 

 the value of a manure admits of exact solution, for phosphoric acid, 

 potassa and ammonia have a regular market value. Using the basis 

 of Prof. Joiinson, and also of Volcker, and Way of England, I esti- 

 mate the value to the tarmer of the various marls, extensively sold in 

 JS'ew Jersey, as follows: 



Per ton. 



Marlborough $P. 51 



Squankum 7 94 



Squankum and Freehold (green sand ) 8 60 



Cream Kidge -i 24 



Pemberton 4.36 



"White Horse ' 6 "05 



West Jersey 7 36 



Woodstown 6 45 



Other Fertilizers. 

 There arc very extensive beds of limestone in all tlie nortlicrn parts 

 of the State. These are of the pure and magnesian varieties, and 

 they furnish an abundant supply of lime for agricultural purposes in 

 all parts of the State. Marsh mud is a substance which may be classed 

 either as a soil or a fertilizer. It has element^ in it whicli make it valua- 

 ble for a dressing upon upland, and it is itself, Avhen properly drained, 

 one of the richest of soils. Here is the analysis of one taken from the 

 marsh on tlie seaside of Cape May county, near the Court House : 



Soluble silica ... ." 15.69 



Sand 48.34 



Oxid of iron ' 3.92 



Alumina 9.41 



Lime 2.17 



Magnesia 1.66 



Potash 2.38 



Sulphuric acid 1.70 



Phosphoric acid 0.33 



Carbonic acid 8.83 



Comiyon salt 2.00 



Oi'ganic matter 6.27 



Water 5.36 



Total 100.06 



Ammonia 0.32 



