INDEX. 



413 



Geographical changes, 395 



" researches, recent, 392 



Geological summary, 305 



Geology, recent progress of, 250 



vs. sugar-refining, 309 



Glacier, greatest in the world, 306 



Glaciers, curious illustration of the 



movements of, 300 



" of Spitsbergen, 300 



Glass, fixing photographic pictures 



on, 146 



Gloire, frigate, description of, C9, 70 

 Glue, substitute for, 59 



Gneiss, formation of, from conglom- 

 erates, 276 

 Gold, natural dissemination of, 312 

 Gonimetroscope, the, 131 

 Granite, aqueous origin of, 305 

 Great Britain, mineral produce of, 308 

 Guano, 234, 235 

 Guinea, New. exploration of, 395 

 Guns, Armstrong and Whitworth's, 



inefficiency of, 84 



Gun cotton, new applications, 55 



" lock, Patterson's improved, 01 



Gunnery, interesting experiments in, 81 

 " Rodman's " " 93 



Gunpowder, application of electric- 

 ity to the explosion 



of, 



Dorcmus' compressed, 

 interesting experi- 

 ments with, 

 " white, 



Gunny bags, what are ? 

 Gutta percha, substitute for, 



" " use of, for artificial 

 hoofs for horses, 



Hail and mist, production of, 

 Hair, changes of color in, 

 Hallucinations, causes of, 

 Heat, animal, origin of, 



" conduction of, by gases, 



" conversion into mechanical 



force, 



effects of long-continued, 

 equivalent of, 



ct 

 u 

 tc 



lightning, what is ? 



It 

 cc 



lunar, 

 of the sun, 



sun's, possible age of, 

 Heather, a native of the United 



States, 

 Henry, Professor, on atmospheric 



electricity, 



Horn, malleable, manufacture of, 

 Horses, artificial hoofs for, 



runaway, new check for, 

 Horticulture, iron as a tonic in, 

 Human race, future of, 



" inferior types of, 

 Hydraulic power, 



Hydrogen, action of, on metallic so- 

 lutions, 



Hyperides, curious discovery of an 

 oration of, 



Ice, artificial manufacture of, 



" ground, formation of, 



" caves, natural, 

 Impressions on sand, new mode of 



preserving, 

 India-rubber varnish, 



114 

 97 



96 

 210 

 311 

 313 



62 



156 

 359 

 343 

 214 

 159 



213 

 271 

 212 

 103 

 158 

 213 

 150 



312 



99 



64 



62 



61 



316 



299 



363 



168 



195 

 404 



63 



15 J 

 155 



50 



451 



Ink, writing, preparation of, 209 



removal of, from paper, 210 



Insect home, 332 



" powders, 315 



Instinct, animal, curious illustra- 



tratious of, 324 



Iodine springs, 237 



Iron and nickel, properties of an al- 

 loy of, 43 

 " steel, action of acids on, 177 

 " " " protection against 



rust, 46 



" use of electricity in 



refining, 105 



as a tonic in horticulture, 316 



cast, resistance of, to pressure, 169 

 changes in the structure of, 33, 41 

 Iron-clad ships, Dahlgren on, 76 



Iron, cold and hot-rolled, cornpara- 



<c 



cc 

 cc 

 <c 



tive strength of, 



44 



cc 



II 



II 



cc 



effects of vibration on the struc- 

 ture of, 33, 41, 42 

 fastening into stone, 177 

 improvements in the manufac- 

 ture of, 175 

 in building, rules for the use of, 45 

 plates, resistance of to projec- 

 tiles, 7, 81 

 wrought, durability of, 38 



Jupiter, observations on the light of, 383 

 Jute, what is? 311 



Keroselene, 197 



Kerosene oil, non-explosiveness of, 208 



Labor, influence of on respiration 



and pulsation, 218 



mental and physical, exhaus- 

 tion of, 218 

 Lakes, American, lunar tides on, 170 

 Language, evidence of in relation to 



the antiquity of man, 297 



Lea, M. C., on picric acid, 212 



Leather, utilization of, 64 



Leaves of trees, how to preserve 



impressions of, 69 



skeleton, how to prepare, 317 

 Light, Bunsen's new investigations 



on, 133 



" electric, new facts concern- 

 ing, 106, 107, 112, 113 

 experiments on the magnetic 



action of, 144 



influence of the colored rays 



of, 150 



persistent activity of, 143 



Lightning figures, 104 



heat, what is ? 103 



Lignites, origin and constitution 



of, 205, 206 



Lime in agriculture, 226 



" phosphate, agricultural em- 

 ployment of, 225 

 Limestones, production of the crys- 

 talline, 289 

 Lint, substitute for in military sur- 

 gery, ( 'l 

 Liquid diffusion, 197 

 Liquids, cohesion figures of, 166 

 gyratory movements of, 1(>7 

 solidification of, 152 

 Liquors, adulteration of, 224 

 artificial, 224 



