410 



INDEX. 



PAGE 



Plants, origin and distribution of spe- 

 cies in, 353 

 Poisons, coloration of, 259 

 Potsdam sandstone, existence of in 



the Rocky Mountains, 327 



Precipitates, determination of the 



value of, 210 



Printing, new method of, 86 



Printing-presses, Bullock's mechani- 

 cal feeder for, 86 

 PROSSER'S condenser, 58 

 Propeller, hydrostatic screw, 52 

 Pump, Tower's elastic ball-valve, 61 



Railing, composite iron, 76 



Railroad cars, gas on, 59 



Razor paper, 96 



Refraction, researches on the indices 



of, 139 



Refraction, solar, 193 



Respiration of the lower animals, in- 

 fluence of light on, 134 

 Retina, duration of luminous impres- 

 sions on, 160 

 Revaccinatiou, 374 

 Rifles, improvements in, 85 

 Robin, American, feeding and growth 



of, 358 



Rocks, conducting power of, 310 



Rosolic acid, 235 



Rotary stability and its application 



to astronomical observations, 171 



RUHMKORFF'S induction coil, im- 

 provements in, 109 

 Ruskin, on mechanical and artistic 



work, 195 



Russia sheet iron, 76 



Saliva and the salivary glands, 356 



Sarcophagus, the Wellington, 81 



Science as a means of education, 97 



Scintillations of stars, 132 



Sea, danger of using red and green 



lights at, 159 



Seeds, on the vitality of, 345 



Sewers, use of charcoal in, 232 



Shells and mortars, Mallet's improved, 85 

 " of animals, mode of formation, 367 

 Ships, steel, 48 



Shot, wind of, 193 



Sicily, coast of, elevation, 307 



Silicates, soluble, use of, 62 



Silk culture in India ? 381 



Silver, restoration ot tarnished, 96 



Soil analysis, 285 



Soils, absorbent power of, 299 



Soils, relations of nitrogen and ni- 

 trates to, 287 

 Solar parallax, 393 

 " spots, 13, 394 

 Sorghum, alcohol from, 249 

 ;t Sprague, on the botany of, 346 

 Sound, experiments on the quality of, 189 

 Sounds, on the mathematical theory 



of, 182 



produced by burning gas, 184 

 Sounding apparatus, Hunt's new, 59 

 Species in plants, origin of, 353 



Star, ocoultation of by a comet, 394 



Stars, scintillation of, 132 



PAGE 



! Stars, variable, 391 



j Steam-engines, duty of, 77 



j Steam-gauges, improvements in, 49 



I Steam navigation, reminiscences of, 68 

 Steamship, novel (Winau's), 47 



Steel, on the manufacture of, 213 



Stereoscope, Almeida's, 157 



Stones, building, strength of various, 80 

 Strychnine, antidote for, 258 



Strychnine, sensibility of tbe princi- 

 pal reagents to, 256 

 Suez, canal across the Isthmus of, 17 

 Sugar, grape, reagent for, 260 

 Sun, nature of the surface of, 128 

 " parallax of 393 



Telegraph, atl antic, 115 



" Bonelli's, 114 



" Hughes's, 111 



Telegraphs, submarine, submergence 



and construction of, 119 



Telescope, new and gigantic, 164 



Telestereoscope, the, 152 



Terraces, formation of river, 296 



Tertiary of South Carolina, remains 



of domestic animals in, 317 



" period, climate of, 328 



Texas, fossils from, 331 



Thermo-multiplier, study of the, 111 



Timber, detection of decay in, 82 



Tin ore from Australia, 342 



Tubes, boiler, brass, copper and iron, 



evaporative power of, 38 



" resistance to collapse, 56 



Tunnel under the Alps, 60 



Types, law of in the animal creation, 362 



Urea, formation of, 



2S4 



VAUGHAN, Prof. Daniel, 298, 389 



Vegetation, relation of, to magnetism, 124 

 " statistics of, 343 



Vision, binocular. 151 



Vitality, production of organic bodies 



without the aid of, 205 



Volcanoes, lunar and terrestrial, com- 

 parison between, 337 

 " mud, of the Colorado des- 

 ert, 332 



Watch movements, American manu- 

 facture of, 64 

 Water, contraction of, experiment il- 

 lustrating, 168 

 " improved method of purifying, 



ing, 231 



" vibrations of, 181 



Waters, iodine in, 230 



specific gravity of sea, 231 



Weights, estimation of very small, 83 



Wheat, new variety of, 352 



Wheat, transmutation into chess, 353 



WINSLOW, Dr. C. F., on comets, 389 



Wool, machine for burring, 90 



Work, refinement of mechanical and 



artistic, 195 



Yeast, German, method of preparing, 274 



Zinc, white, durability of, 96 



Zoology, 355 



law of typical formation in, 362 



