258 



THE CANADIAN NATURALIST. 



[Sept. 



Soluble Phosphoric Acid (P O5) 12 . 33 



Insoiable (anhydrous) 2. 12 



14 . 45 



To produce this fertilizer equal weights of crude sulphuric 

 acid (of chamber strength,) and of the finely divided 

 mineral, are thoroughly mixed in a suitable vat, or tub, until 

 the conversion is deemed complete, when a trap is raised at 

 the bottom of the vessel, and the thick, pasty mass allowed to 

 flow over the floor, where it soon becomes sufiiciently con- 

 solidated to be packed in barrels. * English manufacturers 

 are in the habit of storing their " superphosphates" in pits or 

 cellars built for the purpose, and they thus obtain a fertilizer 

 containing a comparatively small quantity of water. They 

 also employ somcAvhat stronger acid, and agitate the mixture 

 in covered vessels. 



Table III shows the composition of six apatites, represent- 

 ing the pure mineral of diflerent districts ; the first analysis 

 being one made upon a crystal of pure translucent sea-green 

 apatite, from the " crystal vein," on lot 5, of the fifth 

 concession of N. Burgess, which had a specific gravity of 



3.209. 



TABLE VI. 



Comparative Analysis op Apatites and Phosphorite. 



II. 



Phosphoric Acid 41 39 



Lime ' 49.79 



Alumina 



Calcium : 4 . lb- 

 Iron (Fe2 O3) ! tr. j 



Silicic Acid tr. | 



Chlorine , 38 



Fluorine I 3 58 



"Water (Air dried) ' 



41.25 



53.84 



0.38 



Alks 

 0.17 



.29 



0.82 

 4.10 

 und. 

 0.42 



Totals 99.32, lOl.bJ 



III. 



43.0] 

 55.24 



0.09 



0.05 

 und 



IV. 



V. 



41.99 

 55.95 



0.01 



4.20 



98.69 1U2.15 



37.18 

 54.0 



3.15 



1.70 

 0.20 

 2.16 



VI. 



42.34 



55.08 



0.04 



0.34 

 und. 



98.47 y7 80 



I. Bm-o'ess, Canada.- -Broome. 

 II. Krageroe, Xorway. — Volckler. 

 III. Faldigl, Tyrol.— joy. 



I., II., III., and IV., Fluor-Apa- 

 tite?. 



IV. Tokovaia, Ural. — Pusirevski. 

 V. Estramadura, Spain.-Daubeny. 

 VI. Hurdstowu, Xew Jersey, U. S. 

 — Jackson. 



II. Chlor- Apatite. V. Phosphorite 



* Each of which contains 285 lbs. 



