16 



CHEMICAL MANUEES 



TABLE III.— ANALYSIS OF AVERAGE SAMPLE OF A FIELD OF' 

 ORYILLE PHOSPHATE DRIED IX VACUO AT 98° C. DENSITY AT 

 16° C. 3-1307. (H. LASNE.) 



99-85 



TABLE IV.— BEAUVAL PHOSPHATE DEPOSIT. ANALYSIS MADE BY 

 NANTIER AT THE DATE OF DISCOVERY. 



Phosphoric acid 

 Lime . 

 Carbonic acid 

 Fluorine 

 Sulphuric acid 

 Peroxide of iron 

 Alumina 

 Magnesia 

 Sihca . 



Organic matter 

 Water . 



Per cent. 



30-89 



45-33 



2-04 



1-60 



1-84 



0-50 



0-32 



0-16 



0-38 



2-26 



15-99 



101-31 



Which corresponds before drying to a content of — 



Phosphate of lime ....... 67-43 



Carbonate of lime . . . . . . . 4-60 



Calcium fluoride . . . . . . .3-24 



„ sulphate ....... 1-43 



Drying raises the phosphate of hme content of this product to> 

 80 per cent. 



2. Pas de Calais Phosphates. — The phosphate bed situated be- 

 tween the Gault and the Greensand extends over vast tracts. In 

 the Pas de Calais it forms the prolongation of deposits recognized 

 in England as of the same stratigraphical horizon in the counties 

 of Kent, Sussex, and Surrey. There is reason also to assimilate 

 it with the geological horizon exploited in the Ardennes and in the 

 Meuse. It was in the Pas de Calais at Wissant that Berthier first 

 discovered in France the presence of phosphate of lime in nodules. 



