184 



Index. 



PHOSPHATES. 



Siliceous, insoluble, matter, Deter- 

 mination of, in raw 147 



Soil, Necessity for, on the 17 



Soil, Reversion of, in the 23 



Soluble and precipitated 24 



South Carolina, see SOUTH CAROLINA. 

 Sulphuric anhydride in raw, Deter- 

 mination of 147 



Tertiary strata, Workable strata of. 46 

 Value of, to the farmer, Relative . . 23 



Volumetric analysis of 157, 158 



Water, combined, and organic mat- 

 ter, Determination of, in raw 144 



World's approximate consumption 



of 138 



PHOSPHORIC ACID. 

 Calculations connected with the 



manufacture of 132 



Chamber acid required in manufac- 

 ture of, Table of 128 



Chemical composition of 107 



Commercial value of, Fixing 138, 139 



Concentration of weak solutions of. 130 



Cost of manufacturing 133 



Determination, Volumetric, of.. 157-159 

 Gases produced in manufacture of, 



Volume of 88 



Grain crop, Percentage of , in 15 



Hay crop, Percentage of, in 16 



High-grade superphosphates. Table 

 of quantities of phosphoric acid re- 

 quired in the manufacture of 131 



Manufacture of, on the large scale 



from low grade ores 129-133 



Plant required in manufacture of, 



129, 130 



Solution of 45 B., Composition of.. 131 

 Solutions of, Concentration of weak 130 



Solutions of, Strengths of 174 



Straw, Percentage of, in 15 



Superphosphate manufacture, set 



free in the Ill 



Superphosphate manufacture, Table 

 of quantities of phosphoric acid re- 

 quired in 131 



Table for use in manufacture of 



high-grade superphosphates 131 



Table showing strength of various 



solutions of 174 



Tribasic, Composition of 107 



Volumetric determination of 157-159 



PHOSPHORIC ANHYDRIDE 106 



Chemical composition of 106 



Determination of, in raw phos- 

 phates 148 



Determination of, in superphos- 

 phates 155-157 



Determination of, voluraetrically.. 



157, 158 



PHOSPHORIC ANHYDRIDE. 

 Determination of water-soluble, in 

 superphosphates 155 



PLANT growth, Elements of 12 



PLANT REQUIRED IN MANUFACTURE OP 



Phosphoric acid 129. 130 



Sulphuric acid 90, 91 



Superphosphate 123, 124 



PLANTS. 



Composition of 13 



Life of 13 



Migration of phosphates in 17 



PLIOCENE era 45 



PRESSURE of steam in sulphuric acid 

 chambers 90 



PYRITE burners, Regulation of air 

 supply in 88 



PYRITES. 



Air supply in burning 88 



Analysis of 153, 161 



Average composition of 103 



Burning, Furnace used in 86 



Cinders from burning, Value of 87 



Copper, Determination of 159, 161 



Insoluble siliceous matter, Deter- 

 mination of 160 



Iron in, Determination of 161 



Methods of sampling 159 



Residues, Utilization of 87 



Samplings of, for analysis 159 



Sulphur in, Determination of 160 



Sulphuric acid manufacture, Use of, 

 in 86 



PYROXENE, Occurrence and charac- 

 teristics of 29 



Qo EBEC, Canada, Apatite deposits of. 27 



REACTIONS in sulphuric acid manu- 

 facture 85 



ROCKS. 



Archaean ..< 27 



Decomposition of 10 



Limestone, in Florida 65 



Of the Laurentian period 27 



Phosphates, of S. Carolina 46 



Tertiary, Classification of 45, 46 



Varieties of 10 



SAMPLING. 



Phosphate at the mines 143 



Phosphate before shipment 144 



Pyrites for analysis 159 



SANDY soils 11 



SCHEURKR-KESTNER'S experiments 

 with the Glover tower 100, 101 



SCHROTTER'S CO 2 apparatus 146 



SELLING prices of South Carolina 

 phosphate 60 



SELWYN, A. R. C., on the origin of 

 Canadian apatites 36 



SILICEOUS MATTER, INSOLUBLE. 

 In limestone. Determination of 163 

 In pyrites, Determination of 163 



