1-54 



INDEX. 



Plating, ii. 276 

 Planets, i. 422 — 437 

 Points, electrical, i. 331 

 Polarity of the magnet, i. 101 

 Potash, ii. 79. 



-^ , manufacture of, ii. 214 



Potassium, ii. 81 

 Pottery, ii. 228 

 Precipitation, chemical, ii. 5 



Press, Bramah's, i. 115 



Prussian blue, ii. 74 



Prussic acid, ii. 74. 



Pulley, i.41. 



Pump, air, i. 129 — sucking, i. 

 183— lifting, i. 185 — forc- 

 ing, i. 186 — various con- 

 structions of, i. 188 



Pyrometer, ii. 30 



R. 



Recapitulation of the principal 



tacts in vol. i. 446 

 iteceipts, miscellaneous, ii. 316 

 Reflection of light, i. 261 

 Refining metals, ii. 215 

 Refraction of light, i. 234-247 

 Repulsion, i. 22 

 , magnetic, i. 400 



Resin, ii. 129, 239 — animal re- 

 sins, ii. 140 



Retorts described, ii. 9 



Rhodium, ii. 121 



Ribbands covered with gold by 

 a chemical process, ii. 325 



Rupert's drops, ii. 238 



S. 



Sacchrometer, ii. 157 



Saltpetre, ii. 81 



Scapement, i. 86 



Screw, i. 45 



Sea salt, composition of, ii. 83 



Selenium, ii. 125 



Shock, electrical, i. 335 



Silica, ii. 90 



Silks, bleaching of, ii. 173 



Silver, ii. 101 



Silvering, ii. 275 



Size, method of making, ii. 304 



Soap, chemical composition of, 



ii. 84. 128 

 Soda, ii. 82 — manufacture of, 



ii. 212 

 Sodium, ii. 83 

 Soldering, ii. 283 

 Solidity of matter, i. 2. 

 Sound i. 227 

 Spark, electric, i. 328 

 Speaking tubes, i. 230 

 Specific gravities, i. 1 17 — table 



of, i. 122 

 Spectacles, i. 257 

 Spermaceti, ii. 139 



Spouting of water, i. 176 



Springs, nature of, explained, 

 i. 116 



Staining wood, ii. 313 



of ivory, ii. 316 



Stains, method of removing, 

 ii. 310 



Starch, ii. 127 



Stars, fixed, i. 439 



Statera, i. 35 



Steam engine, i. 206 ■ — inven- 

 tion of, 207 — Savary's, 208 

 — Newcomen's,211 — Watt's, 

 216 — Cartwright's, 224 — 

 Highpressure, 224 



Steam boats, i. 225 



Steam used in bleaching, ii. 169 



Stearin, ii. 139 



Steel, ii. 105 — a method of 

 making, 337 



Strontia, ii. 90 



Suction, i. 133 



Sugar, ii. 127 — animal sugar, 

 ii. 140 



Sulphate of lime, ii. 89 



■ of magnesia, ii. 89 



