INDEX. 



331 



Tannin-extracting machine ... 25 



Tanning processes 84 



Tar acids 180 



Target, the Chalmers 107 



Technical education, importance of 4 



Teeth, nutrition, of 277 



Telegraphic meteorometers . . . 169 

 Telegraphy, earth circuit in ... 158 



Telerpeton, affinities of 272 



Telescopes, refracting, local correc- 

 tion for 284 



Telodynamic transmission ... 21 

 Temperature, influence of trees on 300 

 " of last winter . . .305 



" of lower strata of the 



air 305 



" of maximum density 



of water . . . .127 

 " periodical variations 



of 304 



" during solar eclipses 305 



Tetrachloride of carbon .... 258 



Textile fibres, new 79, 80 



Theine, uses of 247 



Theory of Darwin 262 



" of the skull 262 



Thermograph 147 



Timber, durability of 45 



Tin in the United States .... 224 

 Tobacco product of the world . . 323 

 Tb'pler's electrical machine . . .159 



Trail, age of 231 



Transit of Venus . 288 



Transparency of the air .... 305 

 " of metals .... 75 



Trees, form of trunk of 279 



" influence of, on temperature 300 

 " tall, in Australia .... 275 



Tropics, glaciers in 234 



Tubercle, inoculation of .... 259 



Tubular wells 24 



Tunnel, Hoosac 41 



" MontCenis 40 



" from New York to Brook- 

 lyn 42 



Tunnel through a volcano .... 43 

 Turret ships vs. monitors .... 99 



Undina, new planet 295 



Uninflammable dresses . . .95, 97, 98 

 " paint 95 



Variable stars 291 



Variations of climate 303 



" of temperature, periodi- 

 cal 304 



Vegetation, ancient, of North Amer- 

 ica 231 



Velocity of light and sound com- 

 pared 133 



" " shot, initial, how meas- 

 ured 124 



Ventilating fan '.26 



Ventilation, by means of the sun . 171 



Venus, transit of 288 



Vesuvius, volcanic eruption of . . 236 



Viaduct, the Cere 31 



Vitality of seeds 283 



Vitrified photographs .... 141 

 Volcanic eruption in Nicaragua 235 



" " of Vesuvius . 236 



" " flames ... 203 



Wages in Great Britain ... 322 

 War, engineering, American . . 320 



" statistics of 319 



Warp, age of 231 



Water, curious facts about . . . 176 



as a gas absorber .... 205 



" process for softening ... 83 



" purification of 205 



" temperature of maximum 



density of ...... 127 



" wholesome 193 



Wave lengths of spectra .... 133 

 Weather, influence of moon on . . 304 



Wells, tubular 24 



Wheatstone's cryptograph .... 156 

 electro-magnetic ap- 

 paratus 148 



Wheels, chilled 71 



Whitworth ordnance 118 



Wholesome water 193 



Whooping cough, infusoria in . . 279 

 Wilde's electric machine .... 150 



Wines, preservation of 206 



Wood, alcohol and paper from . . 96 



" in paper, tests for . . . .210 



" preservation of ..... 82 



Woodpecker, foresight of .... 271 



Wounds, bayonet 259 



Zinc plates, coloring of 





