578 



SUBJECT INDEX 



Potash decomposed by electric 



current, 273 

 by iron, 275 

 Potassium, 275 

 amalgam, 276 

 chlorate, 227 



composition of, 315, 377 

 formula of, 378 

 chloride, 276 

 decomposes water, 277 

 ethoxide, 423 

 hydroxide, 284 

 iodate, 254 

 iodide, 239 

 oxidation of, 275 

 properties of, 2.75 

 Prehistoric Period, I 

 Principles, three alchemistic, 162, 



448 



Producer gas, 142 

 Prom, 400 

 Propionic acid, 430 

 Protyl, 482 

 Prout's hypothesis, 480 



and the law of probabilities, 



485 



tested, 483, 484 

 Prussian blue, 242 

 Prussiates, 243 

 Prussic acid, 242 

 anhydrous, 24 

 composition of, 243 

 structure of, 440 

 Pyrites, 8 



composition of, 174 

 contains sulphur, 163 

 crystals of, 9 

 oxidation of, 174 

 sulphur in, 14 

 vitriolisation of, 174 

 Pyrolusite, 210 



Quadrivalency of carbon, 437, 



438 

 Quartz, 288 



crystals of, 6 

 Quicklime. 49 



R. 



Radicals, compound, 245 



conjugated, 430 



derived, 416 



diatomic, 433 



fundamental, 416 



monatomic, 433 



polyatomic, 433 

 Radio-active elements, 466 

 Radio-elements, 466 

 Rare-earth elements, 465, 492 

 Rathbone Place water, 103 

 Receiver for gases, 84, 88 

 Reciprocal proportions, 309 

 in acids and bases, 310 

 Red calx of mercury, 39 



lead, 8 



precipitate, 60, 44 

 Reduction, 124 

 Residues, 417 

 Resin, composition of, 391 

 Reversible actions, 499, 5 OI > I2 4 

 Rock-crystal, 6 

 Rouge, 13 



Sal-ammoniac, 5 



composition of, 264 

 crystal of, 4 

 dissociation of, 521 

 dry, properties of, 529, 533 

 influence of moisture on the 



dissociation of, 528 

 prepared from acid air and 



alkaline air, 83 

 volatile spirit of, 57 

 " Sal mirabile," 18 

 Sal sylvii, 20 

 Sal-volatile, 56 



prepared from alkaline air 



and fixed air, 84 

 Salt, 3 



Boyle's definition of, 3 

 common, 3 

 Epsom, 59 

 Glauber's, 18 

 sedative, 288 

 spirit of, 14 



