416 



INDEX. 



PARE. 



Color of salts in solution, 217 



Coloring matter, extraction of, 103 



Combs, ivory, machine lor porting, 

 Combust! )n, inf. of solar light upon, 133 

 Comets, density and mass of, 

 Compass, chronometer, 255 



" Graham's improved magnetic, 172 

 Comet, Biela's, 407 



' Brorsen's, 395 



Conservatism of force, 177 



Conglomerates, origin of, 805 



Coppers, commercial, electric con- 

 ductivity of, 153 

 Corn-husking machines, 11-1 

 Cotton, Sea-Island, machine for gin- 

 ning, 67 

 Cotton-spinning, improvements in, G7 

 Counterfeits, photographic, method of 



detecting, 235 



Couplings^ tubes for, 77 



Dams, vibrations occasioned by water 



falling over 250 



Dead, on the cremation of, 

 Dew, ammonia in, 

 Dial, universal, 



Diamagnetism, character of, 170 



Diamond, use of for lenses of micr's. 226 

 Digestion, experiments on, 342 



Disinfecting powders, composition of, 316 

 Double stars, discovery of, 400 



Drainage, illustrations of, 



264 



Dyeing, some new principles con- 

 cerned in, 341 

 Dynamometer, Leonard's improved, 83 



Earth, density of, 189 



" figure of, 190 



Earth's surface, direction of gravity on 192 

 Earthquakes, consideration of "the 



cause of, 334 



Eggs, preservation of, 111 



Electric currents, existence of opposite 



in the same wire, 146 



Electric conducting power of the alka- 

 lies and alkaline earths, 146 

 Electric machine, simple, 145 

 Electrical apparatus, improved, 154,153 

 Electrical excitation, new source of, 150 

 Electrical figures, new mode of pro- 

 ducing and fixing. 147 

 Electrical fishes, 149 

 Electrical paper, 145 

 Electricity, atmospheric, new method 



of observing, 148 



Electro-dynamic induction machine, 154 

 Electrotype process, improvements in, 172 

 Elements, general methods of prepar- 

 ing, 278 

 Emmons, Dr. E., observations on the 



sandstones of North Carolina, 373 



Engine, Ericsson's hot air, 43 



Engraving by light and electricity, 229 

 Engraving on wood, photographs for, -28 

 Ericsson's Hot Air Engine', 43 



Ether and chloroform, gelatinized, 32S 

 Evaporation, sclar, improvements in, 109 



Fabrics, rendering fire-proof, 



water-proof, 



Figures, electrical, , 



Fires, extinguishing on ship-board, 85 



98 J 

 99,106s 



14? ' 



PAGE. 



Fire-proof fabrics, 93 



Fi-;li, artificially reared, 390 



Fishes, electrical, employment of as 



medical shock machines, 149 



Fishes, habits of. S--Q 



Flax fibres, improvement in the pre- 

 paration of, 67 

 Flutes improvements in, 110 

 Fluids, solidification of, 103 

 Fluorine in the blood, 341 

 Force, disposition of in paramagnetic 



and cliamagnetic bodies, 176 



Force, monogenesis of, 189 



Force, on the conservatism of, 177 



Forces, interaction of natural, 118 



Fossils, new from the I'otsdam sand- 

 stone, 377 

 France, military resources of, 23 

 French inventions, recent, 27 

 Fruits, coloring of the skin of, 333 

 Furnace, hot-air, requisites foraperf. 55 

 Furnaces and heaters, improvm'ts in, 56 

 Furnace, Beaufume's Gas-flame, 49 

 Furnaces, Reverberatory, 56 



Gales of the Atlantic, 402 



(las-burners, anti-flickering [Bacheld- 

 er's], 113 



improved, 113 



Gas-carbon, 272 



Gases, sounds produced by combust- 

 ion of in tubes, 



Gauge, Rugg's Steam-boiler, water, 53 

 Geographical Explorations, recent, 8,9.10 

 Geology, recent progress of, 3J.O 



Gilding and plating, electro, 294 



Gilding, thread or fibre, 60 



Gillespie, Prof, on warped surfaces, 2 ;2 

 Glaciers, theory of, 330 



Glass, plate, improvements in polish- 

 ing and grinding, 91 

 Globe, outline theory of the struct, of 370 

 Glue, cystic, 102 

 Glue, water-proof, 102 

 Glycerine, artificial production of, 



sol vent properties of; 310 



Gold, in the form of malleable sponge,28( 

 Gold, relation of to light, 217 



Gravity, direction of on the earth's 



surface, 192 



Gravitv, specific, estimation of, 265 



Great Britain, mineral productions of 



for IS' ;, 378 



Great Eastern Steamship, construc- 

 tion of, 29 

 Guano, product, curious, 303 

 Gunpowder, improved' method of 



manufacturing. 91 



Gutta-Percha, durability of, 104 



Haarlem lake, effect of drainage on, 83 

 Hallotvr.es, ?31 



Hayes; Dr. A. A., 5?, 295, 293. 303. 305 

 Heat, development of in agitated 



water, 197 



Heat, effect of on the color of dis- 

 solved salts, 

 Heat, on the nature of, 

 Heat, radiant, influence of metals on, 20j 

 Heat, recent discoveries in relation to, 193 

 Helmholiz, M., on the interaction of 

 natural forces, 118 



