XX. LABORS OF THE ICE-BORN TORRENTS, AND THE OCEAN

XXII. FORMER HIGHER LEVEL OF THE GREAT LAKES......................

241

XXVI. SOMETHING ABOUT ROCK-SALT AND GYPSUM....

XXVII. METHOD IN THE GROWTH OF CONTINENTS.

XXVIII. METHOD IN THE HISTORY OF LIFE..

XXIX. WORLD-THOUGHTS

XXXIII. WILL THERE BE AN ANIMAL SUPERIOR TO MAN?...... 373

XXXIV. POPULAR BELIEFS IN PERIODICAL CATASTROPHES TO

XXXIX. THE MACHINERY OF THE HEAVENS RUNNING DOWN... 417

XL. THE CYCLES OF MATTER.....

428

APPENDIX......

433

No.

Trenton High Falls..

1. Fossil Bivalve-view of ventral valve.

2. Fossil Bivalve-edge view of both valves.
3. Common River Mussel-view of left valve...

4. Common River Mussel-view of both valves along hinge line.
5. View of the Temple of Serapis at Puzzuoli in 1836.......
6. View of Graham's Island, July 18, 1831.

7. New Volcano of Santorin, 1866..

8. Work of the Elements at Cape Stevens, Arctic Ocean. 9. Shore Erosion on the Mendocino Coast, California.. 10. Fingal's Cave in Staffa..

11. Comparative Volumes of the gaseous and solid Earth.
12. The Solar System rotating in a gaseous state.
13. Primeval Wrinkles in the Earth's forming Crust.
14. The Primeval Storm.....

ILLUSTRATION S.

Frontispiece.

Page

14

14

14

15. Shore Erosion and distribution of Sediments.
16. Diagram of Chemical Reactions in the Primeval Ocean..
17. Structure of the oldest known Fossil..
18. The Humblest of Living Creatures (Amoeba princeps).
19. Disturbed Condition of Eozoic Strata.

26. A Potsdam Trilobite (Dicellocephalus Minnesotensis) 27. A Trilobite rolled up..

28. Eye of a Trilobite magnified.

29. A Potsdam Sea-weed (Palæophycus arthrophycus).. 30. Outlines of Lake Superior....

31. Section across Lake Superior..

32. The Miner's Castle, "Pictured Rocks," Lake Superior
33. The Sail Rock, "Pictured Rocks," Lake Superior.
34. The Grand Portal, "Pictured Rocks," Lake Superior..
35. Camp on the Beach, near the Chapel.

36. The Chapel, Pictured Rocks," Lake Superior.
37. Chapel Falls, "Pictured Rocks," Lake Superior..
38. Section across the Continent of North America....
39. Hydrographic and Orographic Outlines of North America.
40. A living Crinoid (Pentacriņus caput-Medusæ).
41. A Trenton Trilobite (Asaphus gigas)..
42. The Paper Nautilus (Argonauta Argo).
43. Paper Nautilus with the arms spread.
44. The Eight-armed Cuttle-fish...

45. A "Kraken Octopod" scuttling a Three-master.
46. The Pearly Nautilus (Nautilus pompilius)..
47. A Straight Chambered Shell (Ormoceras tenuifilum).
48. A Coiled Chambered Shell (Trocholites ammonius)
49. A Devonian Cephalopod (Clymenia Sedgwicki)..

79

79

55. The Continent at the end of the Silurian Age....
56. An Upper Silurian Sea-weed (Arthrophycus Harlani).

57. Ideal Landscape of the Devonian Age...

58. Trends of the great Limestone Masses of the United States.
59. Portrait of Hugh Miller, the Scottish Geologist.
60. Miners going down a Shaft...

61. View in an English Coal Mine.

62. Explosion in a Coal Mine..

63. Miner at Work-old manner of working.... 64. Coal-plants on Shale...

65. Ideal Landscape of the Coal Period... 66. Remains of a Lepidodendron..

67. Vertical Tree-trunks in a Coal Mine...

68. The Continent at the end of Paleozoic Time. Frond of an ancient Tree-fern (Pecopteris).

69. Labyrinthodon (restored).............

70. Ideal Landscape of the Age of Reptiles. 71. Ichthyosaur and Plesiosaur in Conflict 72. Haunts of the Pterodactyl....

73. Footprints from the Connecticut Valley. 74. A Three-toed Reptile (restored).

75. Tooth of an extinct New Jersey Saurian..
76. A gigantic extinct Reptile of North America (Hadrosaurus Foulki)
77. The Continent at the end of Mesozoic Time...

79. Portrait of David Dale Owen, the eminent Western Geologist... 80. Great Glacier, Bute Inlet, Alaska..

83. Phenomena of Wells and Springs in Drift Materials.

84. Former High Waters of the Great Lakes...

85. Sugar Loaf, Mackinac Island...

86. Arched Rock, Mackinac Island..

87. Mining Cedar Logs in a buried Swamp.
88. The Noble Oil Well, Pennsylvania...
89. Blowing and Flowing Oil Wells.....

90. View of the Salt Works, Mason City, West Virginia. 91. Section across the Lower Peninsula of Michigan. 92. Section of the Onondaga Salt Basin, New York.. 93. Portrait of Professor James D. Dana..

94. A Reminiscence of the Trilobites (Glyptonotus Antarcticus)
95. Section across the Basin of Middle Tennessee.
96. Upper Cataract Creek, near Big Cañon, Colorado..

100. Engraving by a Pre-historic Artist-the Hairy Mammoth.. 101. The Hairy Mammoth (restored)