INDEX 



377 



Testing steam boilers C9 



Thallium, curious etiect of ... 328 



" mineral 231 



" new source of .... 232 



Theory, meteoric 350 



«' of Diirwiu X. 310 



" " vision 303 



" " volcanoes 26G 



Thermometer, electrical .... 154 



Th\ mic acid 230 



Tides at Hell Gate 185 



Tiers-argent 230 



Toads, venom of 332 



Tobacco paper 102 



Trades unions iv 



Transmission of sound 178 



Transparency of the air .... 348 



Trees, fossil 236 



" vs. evaporation 183 



Tubular vessels of {)lant3 .... 335 

 Tumors, treatment of, by electricity 175 

 Tungsi en-steel magnets .... 184 



Tunnel, Chicago River 51 



" Eastlioston 48 



" Hoosac 49 



" MontCenis 52 



" under the Tees 49 



Twins, Siamese 307 



Types of the human races .... 322 



Underground railway 39 



Upper Mississippi 253 



Uses of paper 93, 103 



Utricularije, air-vesicles of . . . 323 



Varnishes, new 97 



Vegetable hair 98 



Vegetation, lunar 45 



Velocipede, water 32 



Velocity of sound 178 



Venezuela, gold fields of ... . 260 



Venom of toads 332 



Veratria, action of 326 



Vertebral appendages, homologies 



of, in fishes 303 



Vertebrates, eyes of 332 



Vessel of war, new 107 



Vessels, tubular, of plants . , . ..^35 



32* 



Vibrations of sound, made visible . 180 

 Victoria, tertiary deposits of . . . 249 



Vision, theory of 303 



Vitality, as a mode of motion . .276 

 Vitality, elfects of light on . . . 277 

 Viviparous echinoderm .... 316 



Voices, nationality in 333 



Volcanic emanations 260 



Volcano of Santorin 267 



Volcanoes, heights of 256 



" theory of 26<5 



Vulcanized rubber, invention of . 85 



War vessel, new 107 



Warmth of the snow-blanket . .349 

 Waste food, utilization of .... 77 

 Water, action of, on lead .... 228 



*' electrolysis of 218 



" force of 130 



" method of testing purity of 20* 

 " on the planets and stars . 345 



Water-velocipede 32 



Water-proof glue 101 



" paper 102 



Water-wheels, improved .... 105 

 Watering of streets . . .86, 217, 328 



Waves, earthquake 128 



Weight I's. specific gravity. . . . 124 

 West side elevated railway ... 37 

 Wheels, water, improved .... 105 

 Whelpley's process for making steel 17 

 Wild animals, importance of . . . 332 



Wind, pressure of 34 



" strength of 184 



Wines, air-treatment of .... 79 



" preservation of 78 



Wood alcohol 229 



" carbonization of 227 



" preservation of 80 



Wood-hangings 81 



Work vs. food 281 



Workmen, good, scarcity of , . . vi 

 Wounds by Chassepot rifle , . . .329 

 Wrought-iron boilers ..... 70 



Yesso, hairy men of 353 



Zircon, in oxyhydrogen light , . 136 



