INDEX 



Lago di Tolfilo, 152 

 Lakes, Deposits in, 56 

 Lakes produced by earthquakes, 152, 159 

 Land and Water, The distribution of, 31 

 Lariosaurus, The, 234 

 Laurentian Rocks, 133, 201 



Lava eruptions, 105; in N. America, 106; plains, 107 

 Layers of strata which show the history of a place, 37 

 Leakage of the sea bottom, 190 

 Leonids, Lyrids, or Perseids, 99 

 Lias formation, The, 235, 237 



Life, The simplest forms of, 111; theories concerning its 

 origin, 113; early forms, 114; in the Cambrian Period, 

 202 ; in the Silurian Period, 203 ; in the Ordovician 

 Period, 204 



Lisbon, Earthquake at, 148 



Llama, The, 273 



London, What excavations have revealed concerning the 

 site of, 35 



Luray, Caverns of, 196 



Lycopods, 222 



LyginodendronSj 223 



Mammals, The development of, 234, 258 



Mammoth, The, 279 



Mammoth Cave of Kentucky, 196 



Man, 284 



Marble, how it is produced, 133 



Marl in lakes, 57 



Mars, 91 ; as an abode of life, 119 ; atmosphere, 126 



Marsupials, 237 



300 



