INDEX 677 



Potassium permanganate solution, standardization 174 



Potassium-platino-chlorid, differences in crystals 573 



Potassium sulfate, commercial 501 



Protein, separation from amid and other forms of nitrogen 387 



Pure water, preparation 484 



Pyrophosphate, examination for impurities 62 



R 



Rain water, collection of samples 479 



nitrogen in 448 



preparation of samples 480 



Reductor, Jones 169, 170, 171' 



manipulation 175 



Reitmair, value of finely ground bone 47, 48, 49 



Reversion of phosphoric acid, theory 112, 113 



Reverted phosphates, solution with ammonium citrate 149, 150 



phosphoric acid, arbitrary determination 112, 113 



definition 113 



determination 147 



Road materials, sampling 16 



Rodonda phosphate .' 220 



Ross, determination of reverted phosphoric acid 63 



Rossler ignition furnace 97 



Ruffle method, Boyer's modification 345 



observations 344 



official 343 



S 



Salicylic acid method 377 



theory 379 



Salt, agricultural uses 6oa 



hydroscopic character 603 



value 603 



Sample, extraction with distilled water 148 



preparation for analysis 148 



in laboratory 19 



Samples, French agricultural method of preparation 20 



German method of preparation 21 



influence of state of subdivision 19 



international method of preparation 20 



methods of drying 22 



preservation 9 



special cases 22 



subdivision 9 



Sampling i 



barnyard manures 16 



general principles 5 



international methods 18 



method of French experiment station 17 



sugar chemists 17 



methods 8 



minerals 13 



object 6 



official methods 17 



organic materials 15 



road materials 1 6 



