356 



INDEX 



Isobaric surfaces, 264 

 Isobars, 263, 284 

 Isobars and parallels, 268 



and temperature, 268 



course of, 267, 268 

 Isobars, relation to land and waicr. 



268 



Isogonic lines, 202 



Isothermal charts, 240, 242, 243, 245 

 Isotherms, 240, 286 



courses of, 244 



Jetties, 58 



Kames, 126, 128 

 Krakatoa, 19, 164 



Laccolith, 179 

 Lacustrine plain, 147 

 Lag of seasons, 236 

 Lake Agassiz, 136 

 Lake Algonquin, 138 

 Lake basins, origin of, 150 



shape of, 145 

 Lake Bonneville, 149, 150 

 Lake Chicago, 138 

 Lake cliffs, 154 

 Lake Erie, 144 

 Lake Huron, 144 

 Lake Iroquois, 138 

 Lake Maumee, 138 

 Lake Michigan, 144 

 Lake Ontario, 144 

 Lake Pepin, 99 

 Lake Superior, 144 

 Lake Titicaca, 145 

 Lakes, 143 

 Lakes along Red River of Louisiana, 



100 

 Lakes, changes taking place in, 14(i 



climatic effects of, 148 



conditions necessary for, 146 



distribution of, 143 



extinct, 147 



glacial, 134 



intermittent, 146 



oxbow, 88 



river, 99 



salt, 149 



value of, 148 



volume of, 145 

 Land and water, unequal heating of, 



233 



Land breezes, 249, 274 

 Land degradation, rate of, 73 



Land hemisphere, 4 



Landslide, 43 



Lateral moraines, 111, 121, 122, 124 



Latitude, 207, 208 



Lava, 160, 170 



intrusions of, 179 



plateaus of the Northwest, 178 



scoriaceous, 170 

 Levees, natural, 86 

 Life of sea, 343 

 Limestone, 350 

 Limestone sinks, 40 

 Lithosphere, 3 

 Littoral climate, 314 

 Littoral currents, 153 

 Load of rivers, 56, 58 

 Loess, 20, 21 

 Longitude, 207, 208 



and time, 209 

 Louisville tornado, 306 

 Lows, 284 



Magnetic declination, 202 



Magnetic meridians, 202 



Malaspina glacier, 113 



Mammoth Cave, 38 



Mantle rock, 16 



Marysville buttes, 177 



Materials of land, 16 



Mature topography, 73 



Mature valley, 72 



Meandering, 65 



Meanders, flood-plain, 87 



Mechanical work of ground-water, 42 



Medial moraines, 111, 121 



Medicinal springs, 34 



Meridian of Greenwich, 209 



Mesa, 80 



Meteoric dust, 19 



Mineral matter of sea, 40, 328 



Mineral springs, 34 



Mississippi River, delta of, 94, 158 



sediment of, 54 

 Moisture and climate, .'509 

 Moisture of the air, 251 

 Monadnocks, 79 

 Monsoon climate, 314 

 Monsoons, 249, 274, 275, 315 

 Mont Pelee, 165 

 Moraine, ground, 122, 1_'7 



lateral, 111, 121, 122, 124 



medial, 111, 121 



terminal, 111, 122, 124, 127 

 Motions of earth, 206 

 Mt. Hood, 174 



