INDEX 679 



Superphosphates, chemistry of manufacture 277 



prepared with phosphoric acid 282 



Swedish citrate method 98, 99 



Sylvin, description 499 



Sylvinit, composition 494 



description 499, 500 



method of analysis 550 



Tankage 290 



Tartaric acid, influence on phosphoric acid estimation 60 



prevention of iron precipitation 65 



Temperature affecting deposition of potash salts S' 



influence on citrate solubility 1 1 1 



digestion of phosphoric acid 202 



Tennessee phosphates, analyses 35 



character and origin 32 



classification 32, 33 



composition 41 



statistics 40 



Tetracalcium phosphate, molecular structure 195 



Thiocyanates, determination 385, 386 



Thomas meal 203 



slag 192 



Tin, phosphoric acid precipitate 108, 109 



Tobacco and tobacco extract 646 



nicotine determination 647 



stems 526 



composition 527 



waste 526 



Total phosphoric acid determination 147 



official method 59 



U 



Ulsch method, theory 445 



applied to mixed fertilizers 445 



nitric acid method 444 



Uranium method for phosphoric acid 132 



in absence of iron 183 



presence of iron 1 83 



preparation of sample 132, 133 



nitrate solution 1 38 



solution, conduct of titration i4S 146 



correction of titration 142 



errors attending use 143, 144 



standardization 140, 181 



titration 141 



volumetric process, general conclusions 151 



V 



Vanadium, estimation 274, 273, 276 



method of Rosenheim and Holverscheit 276 



