306 



ELEMENTS OF GENERAL SCIENCE 



Hydrogen, 58-03, 68, 74 



Hygienic aspects of nutrition, 262- 



269 

 Hygienic conditions, 92*, 93* 



Ice, 103-117 



Ice cream, 117 



Ice machines, 111, 112* 



Illinois and Michigan Canal, 151 



Indian pipe, 76* 



Inheritance, 299-302 



Iodine, 61 



Iron, 61, 135, 142 



Irrigation, *205-214 



Isobars, *30-39 



Isotherms, *30-39 



Keokuk dam, 167* 



Kerosene, use of with mosquitoes, 100 



Lake breeze, *138~140 

 Lake climate, effects of, 146 

 Lakes, climatic influence of, *136- 



146 



Land breeze, 140 

 Lawn sprinkler, 126 

 Lead, 61, 108, 135 

 Leaf, *68-74 

 Leaf, interior of, 72, 73* 

 Leaf, structure of, *69-73 

 Leprosy, 87 



Life in the soil, 224-226 

 Life-saving stations, 152, 153 

 Light, 75, 76, 185-188 

 Light as source of energy, 75, 76 

 Lighthouse, 2*, 152 

 Limewater, 63 



Liquids and molecular theory, 53, 54 

 Lockjaw, 87 



Low-pressure centers, *30-39 

 Lumbering, *229~232 



Machines, *1 72-179, *183-186 



Magnesium, 61 



Malaria, cause of, 97 



Mammals, reproduction of, 276, 276 



Manganese, 61 



Marble, 64 



Mastication, 254-256, 263 



Matter, states of, 103 



Measurement of work, 177 



Melting point, 108 



Mercurial barometer, 6*, 7* 



Mercury, 7, 61, 135 



Mesophyll. 70. 73* 



Metals, 61 



Milk, 90, 91 



Milk, bacteria in, 91* 



Mistletoe, 84* 



Mixtures of gases, 53, 69 



Moisture of air, 21-27, 36, 45, 46, 47* 



Mold, 79-82, 87 



Molecular theory, 62-64 



Molecules, 52-64, 69, 60, 64, 66 



Mont Blanc, 105 



Morning-glory, overproduction of, 



281, 282 



Mosquitoes, destruction of, 99, 100 

 Mosquitoes, kinds of, 100, 101 

 Mosquitoes, life history of, 97, 98* 

 Mosquitoes and malaria, *97-100 

 Mount Rainier, 9*, 106*, 195* 

 Mushrooms, 83* 



Natural selection, 294, 296 

 Niagara Falls, work by, 165, 166*, 



171* 



Niagara River, 165, 166*, 171* 

 Nickel, 61 



Night, length of, 18, 19* 

 Nitrogen, 61, 65, 66, 243-245 

 Nitrogen, loss from soil, 243, 244 

 -Nitrogen, supply of, 245 

 Norther, 40 

 Nutrition, hygienic aspects of, 262- 



269 

 Nutrition of animals, *253~261 



Oak wood, 135 

 Ocean, 136, 146 

 Offspring and parent, *290-302 

 Osmometer, 235* 

 Osmosis, *234-238 

 Overproduction, 281-284 

 Oxygen, 58-66, 68, 74, 187, 259, 260, 

 268 



Palisade, 73* 



Palmate leaf, 70* 



Parasites, 83, 84* 



Parent and offspring, *290-302 



Pasteurization, 90, 92 



Peach growing and climate, 146 



Peanut seedling, 279* 



Peat, 200, 202, 203 



Perspiration, 113 



Perspiratory glands, 113 



Petiole of leaf, 69, 70* 



Phosphorus, 61, 243 



Photographic plate. '"> 



