INDEX 671 



N itrates, extraction 434 



qualitative tests 434 



reduction by nascent hydrogen 435 



statistics of production in Chili 294 



Nitric acid, absorption in electric manufacture 318 



concentration in electric manufacture 319 



cost of electric manufacture 314 



determination - 391 



ammonia method 433 



ammonium picrate method 464 



colorimetric method 455 



Crum-Frankland method 413 



modified by Noyes.... 414 



de Koninck's modification 409-41 1 



Devarda's method 438 



ferrous chlorid process 413 



French commission method 393-396 



French sugar chemists method 396 



Gantter method 421-424 



Gooch and G-ruener's method 453, 454 



Halle zinc-iron method 435 



Hooker's method 456, 457, 458, 459, 460, 461 



in presence of nitrous acid 465-467 



Kruger's method 446 



Lunge's improved method 416-421 



mercury-sulfuric acid method 413 



Mockern station method 435 



phenyl-sulfuric acid method 461, 462, 463, 464 



Schloesing modification 392 



Schloesing- Wagner method 396 



Schmidt's process 411-413 



Schmitt method 443 



Schultze-Tiemann method 403-407 



Sievert method 440 



Spiegel's modification 407-409 



Stoklasa method 439 



Ulsch method 444 



utility of Lunge's improved method 421 



Warington's method 399-403 



Williams- Warington method 447 



iodometric estimation 450, 451, 452, 453 



manufacture in Norway 314 



production by electric action 313-318 



in the United States 320, 321 



reduction by electricity 447 



sodium-amalgam process 441 



sodium-mercury amalgam 434 



in an acid solution 441 



to ammonia 433 



relation to organic colors 425 



retention by living organisms 298 



Nitric oxid, measurement 403 



Nitrites, influence on Hooker's method 460 



Nitrogen, accumulation 304, 305 



analysis, official method 323 



and phosphoric acid, determination in the same solution 87, 83 



