358 ARTIFICIAL MANURES. 



Professor S. W. Johnson of the Sheffield Scientific School, 

 Yale College the highest authority in America gives the 

 following as the analysis of the best Superphosphate of Lime 

 that ever came under his examination : 



Analysis of Mapes^ Improved /Superphosphate of Lime. 

 Manufacture of 1852. 



Water , 4.54 



Organic and volatile matter 22.96 



Sand and matters insoluble in acids 1.48 



Soluble phosphoric acid 10.65 



Insoluble " " 10.17 



Ammonia 2.78 



Phosphate of lime equivalent to phosphoric acid. . . . 45.11 



The following is also from Johnson : 



Analysis of Cods Superphosphate. Manufacture of 1856. 



Water, organic and volatile matters 38.02 



Sand and matters insoluble in acids 3.37 



Soluble phosphoric acid 3.84 



Insoluble " " 17.84 



Ammonia 3.04 



Phosphate of lime, equivalent to phosphoric acid . . . 46.47 



Johnson also gives the following analysis of bone-ash, or 

 the residue of burnt bones : 



Analysis of Deburg's Bone Meal. 



Water 3.04 



Organic and volatile matters, mostly charcoal 2.07 



Sand and insoluble matters .. 11.19 



