152 



INDEX 



Paradas, 91 



Pebble phosphate ore dress- 

 ing and milling, 37 

 Peruvian guano, 59 

 Pfeiffer's mills, 69 

 Phosphate washer, 41 

 Phosphates, 4, 60 

 Phosphate ore, 37, 43, 52, 



90 

 Phosphoric acid, 5, 7 



determination of, in soils, 



147 



in fertilizers, 127 

 Phosphorite, 22 

 Phosphorus, 22, 52 

 Picking table, 47, 72 

 Portland cement, potash 



from, 119 



Potash, 3, 5, 7, 33, 58, 101 

 manufacture of, from sun- 

 flower plant, 123 

 manures, 101 

 Potassium, 26 

 chloride, 106 



determination of, in fertil- 

 izers, 135 

 manures, 101 

 oxide, 8 

 sulphate, 112 

 Potatoes, 32 

 Precipitated phosphoric acid, 



8 



Psilomelane, 29 

 Pyrolusite, 29 



Q 



Quartz, 19 

 Quick-lime, 11 



R 



Raymond Lulle, 88 

 Redonda phosphate, 61 

 Reverted phosphate, 65 

 Reverted phosphoric acid, 8 

 Rhoden, G. J., patent for 

 obtaining soluble potas- 

 sium from feldspar, 114 

 Rinser, 47, 64 

 River-pebble phosphate, 38 

 Roasting ores, 50, 51 



Sand-rock, 47 

 Separator, 46 

 Shark's teeth, 107 

 Silicon, 17, 18 



Smith, J. Lawrence, extract- 

 ing potash from silicate 

 rocks, 113 

 Sodium, 17, 27, 57 



chloride, 11 



determination of, in soils, 

 145 



nitrate, 33, 57 

 Soft ores, 43 

 Soils, 15, 139 



examination of, 139 



