INDEX. 211 



PAOB 



Githagin 120 



Glass, optical, Bohemian 26 



, aventurine 26 



, ruby, haematinone 27 



brilliants 28 



, platinized 79 



, coppered 80 



cement 155 



Glue cement 155 



Gold, California, analysis of 58 



, extracted from ores 59 



, increased production in 1850 59 



, parting 53 



by sulphuric acid 56 



, toughened 60 



alloys 66-68 



plating 71-78 



, oxide of 71 



and silver, recovered from cyanide solutions 78 



lacquer 153 



Green dye from chrome 141 



Gums, bleached 173 



Gun cotton, its danger 22 



, composition of 23 



Gunpowder, new composition 22 



Guttapercha 150 



Gypsum 36 



Hair varnish 147 



Hsematinone 27 



Hemp and flax 127 



Honey, analysis and purification of 175 



Horse-hair, dyed 147 



chestnut, as food 187 



Horn, dyed 147 



Hydrated silicic acid 28 



Hydraulic cement 34-36 



Hydriodic acid 115 



Hydroplastics 33-38 



Hydrometallurgy 69-90 



Hydrogen for illumination 169 



Hyposulphite of soda.; 86 



Ice, artificially made 189 



Illumination 165-171 



Indigo, tested 138 



dye 140 



, white discharge on 142 



