12 CHEMISTRY INDISPENSABLE 



when continued investigations shall have established 

 beyond all doubt what are the separate component 

 parts of those manures necessary to the nourish- 

 ment of each individual plant ? Since the English 

 have succeeded in tracing phosphorite, a stone 

 which consists of the same component parts as 

 bone-earth, throughout a mountain range in Spain 

 for upwards of four miles, the possibility seems 

 scarcely to admit of doubt, that, by more exact chem- 

 ical scrutiny, various kinds of stone or earth, or other 

 substances possessing the fertilizing power of ma- 

 nures, or capable of acquiring it by admixture with 

 other elements, may be brought to light around us, 

 and perhaps even in our own immediate neighbor- 

 hood.* 



* There are two Jocalities in the United States where this natural 

 phosphate of lime is abundantly found. Specimens from both have 

 been analyzed by Dr. Charles T. Jackson, with a view to their use in 

 agriculture. 



The crystallized phosphorite, from Hurdstown, New Jersey, con- 

 tains, according to his analysis, 



Phosphate of lime, 92 per cent. 

 Fluate oflime, 7 « 



The eupyrchroite of Emmons, from Crown Point, Essex County, 



New York, contains, according to the same chemist, 

 Lime, 47.22 per cent. 



Phosphoric acid, 45.70 " 



These require to be ground very fine, and mixed with sulphuric 

 acid, in order to render them quickly available to crops. The appli- 

 cation of these substances being new, the experience of the chemist 

 is required to point out the most advantageous method of use ; yet as 

 they contain ingredients absolutely necessary for grain, no doubt can 

 exist as to their value. — J. E. T. 



