852 



INDEX. 



Powder, fuel in the form of 129 



Powdor, aimuonia 1 14 



I'oisuu of Hatracluans 300 



Poisous, notion of. 278 



Polarization of the corona :J21 



Polarizing prism, u new 14(5 



I'ortabk- illiiniinatious 00 



Primordial llora 307 



Practical application of sensitive 



tlames 87 



Proposii'd tnnnel under the British 



Channel 58 



Proof of frnns Ill 



Preserving silver-ware 227 



I'rimordial fauna 201 



Process for i)reservation of bottoms 



of iron ships 115 



Process, new oxygen 71 



^'reserving insects 307 



I'risni, new polarizing 14l5 



Prism, rock salt 144 



Protuberances of the sun, observa- 

 tions on the 322 



Proportion of alkalies in plants 221 



Production of cold 191 



Preservation of wines 203 



Pulse, photograpliic representations 



of the 270 



Pump, centrifugal 55 



Pulsations of man rendered audible 



and visible 303 



Pulse, electricity and the 153 



Pure iron 196 



I'urifying water 215 



I'urilication of bisulphide of carbon. 200 



I'urifying sewage 215 



Pyrometer, a new 189 



Question, sewage 72 



Quaternary period, man in the 287 



Quartz, smoke-colored 264 



Pailway, Mt. "Washington 22 



Kailwav carriages — wliy do they os- 

 cillate 23 



Railway, the Channel 19 



Railways of India 16 



Rainfall and temperature, planetary 



i ntluence on 327 



Radiation of heat from the moon. ..187 



Rapid change of gauge 55 



Rails, steel 30 



Railway, narrow gauge 30 



Rail levelling device .35 



Railroads and electricity 23 



Rails, American 33 



" test for steel 32 



" steel-capped 32 



" steel-headed 68 



Reproduction in a fish, singular mode 



of 305 



Reptilian remains 2.53 



Reliuing vegetable oils 83 



Reproductive organs of lichens 309 



Researches on materials lit for resist- 

 ing very high temptrafurea 81 



Relation between the intensity of 

 light i)roduced from the combus- 

 tion of illuminating gas, and the 

 volume of gas consumed 96 



Respiration vs. the temperature of 



t he blood 274 



Resistance of roads to traction 54 



Respiration vs. section of pheumo- 



gastric nerves 302 



Reptiles, new fossil 290 



Resjiiration, art ilicial 275 



Reagent for alkaloids 229 



Reduction of oxides by hydrogen. .. 197 



Researches on rtsins 218 



Red Sea and the .Mediterranean, dif- 

 ference of levi'l between the. ..207 



Researches, lithographic 205 



Reptiles, Hlosasauroid .. .255 



Reproduction of diatoms 308 



Kei)tiles, extinct 305 



lioads and railways of India 17 



Rocky ^lountains, trend of the 2.52 



" coal in the 243 



" Ali)ine region 248 



Route to the North I'ole 250 



Hocks, mineralogical analysis of. ...153 



Rock salt prisms 144 



Roller, moss rubber inking 131 



Royal rolyteclmic, induction coil at 

 the 158 



Safety, nitro-glycerine 1.32 



Salt deposit near Berlin 227 



Safety envelopes 1.35 



Saline solutions for street watering. 73 



Saw-dust, paper from 135 



Sacc on resins 218 



Scheelite, occurrence of 202 



Sewage 215 



Sea-water, temperature at great 



di-pths of. 188 



Sea-depths 207 



Sea, phosphorL'Scence of the 190 



Section of pheumo-gastric nerves vs. 



respiration .302 



Sea, bottom of the 307 



Sensitive llanies, practical applica- 

 tion of 89 



Sea-going ships 85 



Sewage (juestion 72 



Selection, natural 283 



Sea basins, depression of. 232 



Sea-shores, change of level of. 237 



Seaweed cliarcoal 130 



Ships, lights 85 



Silvering cast iron .225 



Silica, new form of. 227 



Silver, determination of. 231 



Siphon, inverted 55 



Signalling on board the cable lleet..lOl 



Singing mice 301 



Silver extraction — electro-chemical 



treatment 81 



Sky, blue color of, etc. Prof. Tyn- 



dall •138 



Sponge, vitality of the 306 



Sponge, the glass-rope 305 



Sliding of car-wheels 28 



Smoke-colored quartz.. 264 



Smelting, carburizing, and purifying 



iron 03 



Solar heat as a motive power 79 



South American Indians and Ne- 

 groes 284 



