m)EX OF SUBJECTS IN GENERAL GEOLOGY ILLUSTRATED 

 OR DISCUSSED IN THIS VOLUME. 



Albertite, Origin of, . . . 

 Antholitbes, Nature and Affinities of, 

 Calamites, Stmcture and Affinities of, 

 Carboniferous System, Structure of. 

 Coal, bow Accumulated, 

 Structure of, .... 



Colour of Sediments, . 



Concretionary Structures, 



Cycles in Geological Time, 



Cordaites, Nature and Affinities of, 



Copper, Native, Origin of, . 



Erect Trees, Preservation of, * 



Footprints in Aqueous Deposits, 



Frost, Action of, . 



Forest Fires, .... 



Flora of the Coal Period, 



of the Devonian Period, . 



Gold, Origin of, and Mode of Occurrence, 



Glacial Action, 



Gypsum, Origin of, .... 



Huronian Period, ..... 

 Ice, Transporting Power of, . 

 Insects of the Coal Period, .... 



of the Devonian Period, 



Life in the Coal Lagoons and Estuaries, 

 Life in the Carboniferous Sea, 

 Lepidophloios, Nature and Affinities, . 

 Lepidodeudron, Nature and Affinities, 

 Laurentian Period, ..... 



Lower Silurian, Peculiarities in Eastern America, 

 Megaphyton, Nature and Affinities of, 

 Metamorphism, ..... 



Modern Alluvia, ..... 



Pre-bistoric Man, ..... 



Permian, Absence of, in Eastern America, , 

 ■ Plaster-pits, Origin of, . 

 Pulmonates of the Coal Period, . 

 Primordial Fauna, ..... 



Rain-marks, ...... 



Reptiles of the Coal Period, 



Sand Dunes, ...... 



Submarine Forests, 



Sigillaria, Nature and Affinities of, 

 Sternbergia, Nature of, . 

 Stigmaria, Nature of, . 

 Triassic Period, Conditions of, 

 Trigonocarpum, Nature and Affinities of, 

 Tracks of Worms and Crustaceans, 

 Upper Silurian of Eastern America, . 



128, 

 131, 



28, 



41 



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