418 



INDEX. 



PAGE. 



Potash, bichromate, use of for pre- 

 servative solutions, 

 Potato, chemical properties of, 

 PRETSCU, M. process for engraving, 

 Printing, new system of nature, 



presses, improvement in, 

 " surfaces, improvement in. 

 preparing, 07 



Prism, use of in qualitative analysis, 212 

 Problems, impossible, 118 



Propellers, screw, 35 



Pulsation, experiments on, 240 



344 



339 



229 



93 



93 



Pumping engines, 



45,46 



Ray Society, proceedings of, 5 

 Reflectors, improvements in, 221 

 Regulators, steam and fire, 51 

 Respiration a cause of circulation, 392 

 RITCHIE'S improved electrical appa- 

 ratus, 156 

 Ronds, steam carriages on, 39 

 Rocks, horizontal heave of, 359 

 Rocks, Von Fuchs, on the formation 



of the primitive, 300 



Russian Geographical Explorations, 14 

 Rust spots, removal of from white 



linen, 317 



Salt, function of, in agriculture, 337 

 Salt, improvements in the manufac- 

 ture of, 109 

 Salt, rock, observations on, 302 

 Salts>,statisticsof manufacture in U. S, 107 

 Salts, color of in solution, 217 

 Salts, observations on the solubility 



of, 300 



Sanatary studies, importance of, 116 

 Sandstones, new red of the Atlantic 



states, 373 

 Sandstones of the Connecticut River 



Valley, 375 

 Sapphires, artificial, 291 

 Saturn's Rings, stability of, 394 

 Science and commerce, union be- 

 tween , 21 

 Screw-propellors, construction of, 35 

 Sea-level, existence of forces capable 



of changing, 357 

 Sea-water, existence of copper in, 276 

 " " silver " 274 

 Seeds, vitality of, 384 

 Selenium, crystalline form of, 271 

 Sexes, production of at will, 388 

 Shells, fresh-water, corrosion of, 347 

 Shutters, fire-place, 53 

 Silicates, alkaline, formation of, 299 

 Silicification, process of, 305 

 Silicium, and the metallic siliciurets, 285 

 new oxide of, 286 

 Silurian system, the, 358 

 Silver, in sea-water, 274 

 Silver, new alloy of, 296 

 Skin, action of tannin upon, 327 

 Skin " bronzed," 392 

 Smoke, arrangement for the con- 

 sumption of, 53 

 Social Science, British Association 



for promotion of, 115 

 Solids, crystalline, molecular aggre- 

 gation of, 263 

 Sorgho, coloring matter from, 334 



I PAGE. 



I Soundings, deep-sea, 379 

 Sound, effect of wind on the intensity 



of, 248 

 Sounds produced by the combustion 



of gases in tubes, 242 

 Speculum, telescopic of silvered glass, 222 

 8phygmot-:cope, 3o9 

 Spinning, cotton, improvements in, 67 

 Stars, double, 400 

 Stars, fixed, photographs of, 227-8 

 Statistics of British manufactures 67 

 Steam and fire regulators, 51 

 Steam on common roads, 39 

 Steamer, large screw, 38 

 Stearine and Oleiuc, production of, 314 

 Steel, hardening of, 69 

 Steel, new process for the manufac- 

 ture of, 292 

 Stereoscopes, telescopic, 

 Stone-work, prevention of decay in, 101 

 Subsidence of coasts, 

 Sugar, grape, preparation of pure, 327 

 Sugur of the sorghum, 330 

 Sugar, Oxland's method of refining, 334 

 Sulphur, different conditions of, 271 

 Sulphurium, 271 

 Summator, Jones's, 81 

 Sun, actinic power of, experiments on 211 

 Sun and earth, central relations of, 384 

 Sun-dial, new, movable horizontal, 230 

 Sun, observations on. 397 

 Surfaces, warped, of ground, on the 

 estimation of, 262 



Tallow and soapworks, prevention 



of Kuisauces arising from, 315 



Tannin, action of upon the skin, 327 



Tanning, improvements in, 104 



Targets', iron, experiments on, 86 



Telegraph, House's, improvement on 1G2 

 Telegraph, magnetic, anticipation of 



the discovery of, 163 



Telegraph, Submarine Atlantic, 164 



Telegraphic memoranda, 162 

 Telegraphic purposes, application of 



steam to, 163 

 Telescope for the Paris observatory 337 

 Telescopic speculum of silvered glass, 222 

 Temperature of the ocean bottom, 379 

 Thermoheliostat, 119 

 Thermometric apparatus, improve- 

 ment in, 207 

 Thought, measurement of the rapid- 

 ity of, 251 

 Thunder storms, contributions to our 



knowledge of, 256 

 Tidal action, influence of on lunar 



and terrestrial motion, 190 



Tides, observations on, 190 

 Time, establishment of uniform, by 



means of the telegraph, 252 

 Transmutation of metals, experi- 

 ments on, 270 

 Trees, contrivance for transplanting, 111 

 Trees, machines for felling, 114 

 Trees, mammoth of California, 385 

 Tripod, Cavendy's nautical, 256 

 Tubes for couplings, 77 

 Tungsten and its compounds, 282 

 chemical character of, 284 

 Type, improved alloy for, 78 



