INDEX. 



4,55 



Sulphate of barytes, ii. 90 



of iron, ii. 105 



of copper, ii. 1 9 



of soda, ii. 83 



Sulphur, ii. 67 

 Sulphuretted hydrogen, ii. 61 



Tannin, ii. 131 



Tanning, ii. 201 



Telescope, i. 297 



, refracting, i. 297 



, binocular, i. 301 



, reflecting, i. 303 



, acromatic, i. 308 



Terella, i. 405 

 Thorina, ii. 93 

 Tides, cause of, i. 444 

 Time keeper, i. 84 

 Tin, ii. Ill 



Sulphuric acid, ii. 69 

 Sulphuring in bleaching, ii. 172 

 Sun considered as the centre of 



our system, i. 431 

 Syphon, i. 179 



T. 



Tinning, ii. 281 

 Titanium, ii. 123 

 Tobacco-pipes, manufacture 



of, ii. 234 

 Tombac, ii. 110 

 Torricellian vacuum, i. 129 

 Touch, magnetic, i. 406 

 Transparencies, method of 



making, ii. 407 

 Trumpet, speaking, i. 231 



hearing, i. 231 

 Tungsten, ii. 120 



U&V. 



Uranium, ii. 124 



Varnishing, ii. 239 



Vacuum Torricellian, i. 129 Vegetable substances, ii. 125 



Boylean, i. 129 

 Valves, i. 202 



Verdegris, ii. 1 10 

 Vision, cause of, i. 244 



W. 



Watches, i. 84 89 

 Water, chemical constituents 



of, ii. 54 



Water-spouts, i. 175 

 Wax, ii. 132 

 Weather-glass, i. 150 

 Wedge, i. 44 

 Wheel and axis, i. 36 



Zenith, i. 415 

 Zinc, ii. 1 14 



Wheels, bevelled, i. 60 

 Wheels carriages, i. 101 

 Wind gauge, i. 152 

 Winds, various classes of, i. 172 

 Wood-cutting, ii. 443 

 Woody fibre, ii. 131 

 Wool, bleaching of, ii. 171 



Z. 



Zirconia, ii. 93 

 Zodiac, i. 419 



THE END. 



