INDEX. 271 



Gravity, . . . . . . 26 



Gravity, specific .' 



Galvanism, ..... 39 



Gases, properties of . . . . .40 



Gum, '.,.... 59 



Gluten, .'..... 60 



Geology, .... .73 



Gorge, . .' . .76 

 Granite, . . J . . 



Greenstone, . .' . . . 83 



Gneiss, ...... 85 



Graphite, .... 



Genus, defined ..... 93 



Germination, . . . . . .101 



Granulated roots, . . . . . 104 



Gale, . . 145 



Gypsum, . ., ;. ^ ,_ . 165 



Gelatine as manure, . *. . . .193 



Guano, ...... 196 



Green manures, ..... 200 



Green manures, uses of . . 200 



Glauber's salts as manure, . , jf .-; . 204 



H 



History, natural . . t . . 21 



Hydrogen, . . . . . .41 



Hartshorn, spirits of . . . 51 



Haematoxyline, . . . . .65 



Hornblende slate, ..... 86 



Hornblende, basaltic, composition of . . A * " 87 



Herbs, 106 



Hail, .... ,; . - . . . 140 



Harmattan, . . - -;. ' j.'>, . 1^4 



Hurricane, . . . . . .145 



Halo, . . . , \ . . 147 



Humus, . . . . . .168 



Humus, its composition . . . . 169 



Hair as manure, . . . . .192 



Horns as manure, . . ..'. . 192 



Hoofs as manure, . . * . * . 192 



