GENERAL INDEX. 



407 



Railways, progress of in the U. S., 29 



Railway axles, improvement in, 27 



Rain-drop impressions, in the carbon- 

 iferous and triassic formations, in- 

 ferences deducible from, 261 



Rattlesnake, influence of the poison of 

 upon plants, 336 



Recognition of a mathematical law in 

 geological science, 244 



Red prominences upon the sun, seen 

 during an eclipse, 384 



REDFIELD, W. C., MR., 



Remedy for near-sightedness, 363 



Removal of obstructions in "Hell 

 Gate." Long Island Sound, 88 



Reptilian foot-prints in Eastern Penn- 

 sylvania, 316 

 " " in the infra-car- 

 bonaceous red shale of Pennsylva- 

 nia, 315 



REYNOSO, M., 217 



Rigidity, cadaveric, experiments on, 363 



Rifles, Jennings' patent, 54 



" Maynard's self-priming, 



Ring, new, of Saturn, 374 



Riveting machine, 



Rocks, not formed by infusoria, 261 



" solidification of, of the Florida 

 reef, 275 



ROGERS, PROF. H. D., 244, 245, 313, 315 



Roofing, new, 



Rudder, duplex and screw, 

 metallic, 

 of a ship, novel. 



Safe for the Koh-i-noor diamond, 18 



Safety-lamp, improved, 



Safety-valve, Nasmyth's, 



Salt-lake of Utah, 



SANDERS, MAJOR, 67 



Sandstones, age of the Connecticut 



river, 259 



of Lake Superior, 260 



" paleontology of the low- 



est in the Northwest, 312 



Sapphire, red, 292 



Satellites, new, of Uranus, 



Saturn, new ring of, 374 



Sawyer and Gwyne's static-pressure 

 engine, 



SCHJEFFER, MR. G. C., 212 



Screw TS. paddle, 



Screw propeller and duplex rudder, 



Seasons, alternation of cold and warm, 391 



Sea-sickness, 369 



Seeds, vitality of, 325 



Sewing machine, Singer's, 



SEQ.NARD, M. BROWN, 367 



Shells, Cumming's celebrated collec- 

 tion of, 



Shells, extinction of species in Ohio, 345 



SHEPHERD, PROF. FOREST, 289 



Ship-building and navigation in the 



United States, 30 



" largest, in the world, 35 



Ships and steamers, improvement in 

 the construction of, 32 



SILLIMAN, PROF. B., JR., 280, 283 



Silurian epoch, fossils of, 313 



Silurian, lower, tracks and trails in, 314 

 system of Bohemia, 255 



Smalt, manufacture of, 192 



SMITH, DR. J. LAWRENCE, 145, 147, 293 

 Snakes, fossil eggs of, 317 



Snow phenomena, curious, 393 



Soap and turpentine, improvements in 



the manufacture of, 197 



Soda, new process for the manufacture 



of, 195 



Soda and potash, quantitative separa- 

 tion of, 217 

 Solar eclipse, July 23th, 1851, 331 

 Sound, determination of the velocity 

 of, by the method of coinci- 

 dences, 153 

 intensity of, in the rarefied air 



of high mountains, 150 



" limit of perceptibility of, direct 



and reflected, 153 



" velocity of, 152 



Sounding machine, new, 72 



Soundings, deep sea, 270 



South Carolina, pine barrens of, 370 



Spectral appearances, reality traced to 



natural causes, 204 



Speed, illustrations of locomotive, 165 

 " of the magnetic current, 104 



SPENCER, MR. CHARLES A., 147 



Spike machine, improved, 

 Spring, Tuscarora sour, 281 



Stalactites and stalagmites, organic 



matter in, 224 



Starvation in Ireland, external symp- 

 toms of, 366 

 Static-pressure engine, 

 Steam boilers, improvements in, 23 

 " engines, improvements in, 21 

 " " nominal horse-power 



of, 163 



" gauges, 24 



" high-pressure, effect upon or- 

 ganic bodies, 230 

 '' power on canals, 23 

 " " used at a distance, 22 

 STANLEY, HENRY, 71 

 Steel, chemical character of, 178 

 " manufactures of Sheffield, Eng., 49 

 Stereo-chromie, 186 

 STIMPSON, MR., 321 

 Stomach, existence of live animals 



in, 369 



Storm, equinoctial, 

 Strata, plication of, 



Stratification, origin of, 246 



j Submarine explorer, 

 I Suez, Isthmus of, 



' Sugar, detonating, 221 



" improvements in the manufac- 

 turing of, 195 

 " Melsen's process, 195 

 " machine, Kurd's centrifugal, 62 

 Sulphur, detection of, 211 

 Sun's light and heat, nature and source 



of, H8 



" rays, a machine substitute for, 70 

 Superior, lake, lithological characters 

 of the sandstones and trap of, 260 



