498 



INDEX OF PRINCIPAL TOPICS. 



Eozoon, Preservation of and Struc- 

 ture, 143. 



Eyes, earliest Types of, 331. 



Evolution, its partial Character, 

 188. 



Flora of White Mountains, 421. 

 Floras originate in the Arctic, 297. 

 Floating Ice, 360. 

 Footprints of Reptiles, 260. 



of Limulus, 319. 



Fossils, Preservation of, 1 36. 

 Fucoids, 311. 



Galapagos, how Peopled, 412. 

 Geographical Changes and Climate, 



390. 

 Geological Record, Imperfection of, 



40. 



Glaciers, Work of, 353. 

 Glacial Period, Conditions of, 375. 

 Gulf Stream, 388. 



Hydrous Silicates, 144. 



Huronian as a Geological System, 



104. 

 Hylonomus Lyelli, 279. 



Icebergs, their Nature and Work, 

 348. 



Ice Age, the, 343. 



Imperfection of the Geological Re- 

 cord, 40. 



Land and Water, 58. 

 Land Snails, Earliest, 247. 

 Labyrinthodonts, their Origin and 



History, 265. 

 Laurentian System, 97. 



Life in the, 107. 



Laurentide Glaciers, 364, 368. 

 Leda Clay of Lower St. Lawrence, 



365. 



Life, First Appearance of, 19, 96, 



157- 



Limbs, the Earliest, 337. 

 Limulus, Footprints of, 319. 



Magmas under Crust of the Earth, 



63- 



Mammoth Age, 466. 

 Man in Nature, 484. 



Early, 461. 



an Imitator of Natural Objects, 



490. 



at War with other Natural 



Agencies, 495. 



in harmony with Nature, 496. 



Markings, Footprints, etc., 301. 



Rill and Rain, etc., 317. 



Microsauria, 279, 

 Migrations of Plants, 434. 

 Millipedes of Carboniferous Age, 



295- 



Mineral Charcoal, 237. 

 Missouri Coteau, 271. 

 Mountains, Origin of, 33. 



Classes of, 66. 



Mount Washington, 426. 



Nature, Various Senses, of the 



Term, 483. 

 Neanthropic Age, 472. 



Ocean, the Atlantic, 58, 67. 

 Oceanic Islands, 407. 



Palanthropic Age, 462. 

 Permanence of Continents, 31, 403. 



of Animal Forms, 87, 180. 



Plants, Geological History of, 202. 



as Indicators of Time and 



Climate, 229. 



of the Erian, Carboniferous, 



etc., 202. 



of the Pleistocene, 439. 



