INDEX. 



4.55 



Sulphate of barytes, ii. 90 



of iron, ii. 105 



of copper, ii. 19 



of soda, ii. 83 



Sulphur, ii. 67 

 Sulphuretted hydrogen, ii. 61 



Sulphuric acid, ii. 69 

 Sulphuring in bleaching, ii. 172 

 Sun considered as the centre of 



our system, i. 431 

 Syphon, i. 179 



T. 



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 



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 



Vacuum Torricellian, i. 129 



Boylean, i. 129 

 Valves, i. 202 



Varnishing, ii. 239 

 Vegetable substances, ii. 125 

 Verdegris, ii. 110 

 Vision, cause of, i. 244 



W. 



Watches, i. 84 — 89 

 Water, chemical constituents 



of, ii. 54 

 Water-spouts, i. 175 

 Wax, ii. 132 

 Weatlier-glass, i. 150 

 Wedge, i. 44 

 Wheel and axis, i. 36 



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 



Zenith, i. 415 

 Zinc, ii. 114 



Z. 



Zirconia, ii. 93 

 Zodiac, i. 419 



THE END. 



