AGRICULTURAL TEXT-BOOK. 



plaster, earth, salt, and other cheap ingredients with it. When 

 purchasing, the fanner should procure an analysis of the sam 

 ples and afterwards compare them with the bulk. In Great Bri 

 tain the manufacture of fictitious and worthless manures is said 

 to have become an extensive trade, the farmers thus losing large 

 ly from their ignorance of chemistry. On a small scale, bones 

 may be rendered partially soluble by breaking or grinding, and 

 mixing with fresh wood ashes, to be kept moist for a month or 

 two. 



687. In the United States, Mineral Phosphate of lime or 

 Apatite has been found and dug in considerable quantities at 

 Crown Point, ~N T . Y., and in New Jersey; some of which has 

 been exported to England. So far, the purity appears to differ 

 much, and the expense of mining and dissolving, has discouraged 

 the progress of the works. The following are Dr. Jackson s an 

 alyses of pure specimens of the minerals, compared with Prof. 

 Johnston s analysis of bones. 



New York. New Jersey. Bones. 



Lime, 47 230 ? 



Phosphoric Acid, 45.710 &amp;lt; 92 - 405 55 - 50 



Car bouic Acid, 1.218 



Lime, 1.554 



Chlorine, 0.130 



Calcium, 0,204 



Fluoriae, 0.590 ., n 



Calcium, 0.855 7 12 



Protoxide of Iron, 2.000 040 



Water, 0.500 20.00 



Oxide of Manganese, 0.003 



Phosphate of Magnesia, 2.00 



Soda and common Salt, 250 



Gelatine (animal matter,) 33 00 



(See Jour, of Boston Socy. of Nat. Hist.} 



Many Marls, especially those formed of recent shell, and some lime 

 rocks, contain notable proportions of the phosphates. 



688. FISH are also a valuable manure, where they can be had 

 in quantities. On parts of the New York and New England 

 coasts they are annually caught in vast shoals for this purpose, 

 and the time will come when the streams and lakes of the West 



.00 



0.540 



