358 



INDEX 



H 



HEMOGLOBIN, 313 



Hair, as a fertilizer, 219 

 Halite, 171 

 Hard rubber, 92 



water, 181 

 Hay, 121 



chemical change in making of, 

 122 



crops, changes in composition of, 

 during making, 123 

 Heat caused by germination, 21 



production in the animal body, 

 337 

 Height of air, 131 

 Hellebore, 284 



Hemlock wood and bark for tan- 

 ning, 102 

 Home mixing of fertilizers, 201 

 Hoof as a fertilizer, 219 

 Horn as a fertilizer, 219 

 Hornblende, 170 

 Hot manures, 262 

 Humid soils, 187 

 Humus, 146 



composition of, 148 



properties of, 147 

 Hydrated lime as a fertilizer, 249 

 Hydrocarbons in crude petroleum, 



300 

 Hydrocyanic acid gas, 286 

 in linseed press cake, 77 

 in oil of bitter almonds, 82 

 Hydrogen in air, 135 



function of, in plant, 40 



Iceland spar, 51 



Igneous rocks, 183 



Inactive organic matter, 141, 150 



Incomplete fertilizers, 201 



Indirect fertilizers, 200 



Inoculation of soils, 157 



Inorganic acids in soil, 164 



elements,* function of, in animal, 

 336 



material, use of, by plant, 31 

 Insecticides, external, 286 



internal, 284 

 Insects, how destroyed, 281 



Intermolecular respiration, 35 

 Intestinal digestion, 330 



juice, 330 

 Inulin, 71 

 Invert sugar, 59 

 Invertase, 331 

 Iodine compounds in the animal, 



323 

 Iron compounds in the animal, 322 



function of, in plant, 46 



minerals in soil, 170 



Kainite, 236 

 Kaolin, 168 

 Kaolinite, 168 

 Kaolinization, 168 

 Kelp, 236 

 Kephir, 350 

 Keratin, 311 

 Kerosene emulsion, 287 



how made, 301 

 Kino, 103 

 Koumiss, 350 



Lac, 89 



Lactalbumin, 344 



Lactase, 331 



Lacteals, 333 



Lactic acid production in milk, 343 



Lactose, 342 



Land plaster. See Gypsum as a 



fertilizer, 255 

 Lard, 320 

 Latex, 91 

 Lavas, 185 



Lead acetate, use of, in making lead 

 arsenate, 284 

 arsenate, 284 



use of, with Bordeaux mixture, 

 293 

 with lime-sulphur, 290 

 nitrate, use of, in making lead 

 arsenate, 284 

 Leaf, structure of, 32 

 Leather as a fertilizer, 219 

 Lecithin, description of, 79 

 Legumes, composition of, 111 



