CONTENTS. 



I. Hutorieal Notice qf the Pr^Carbon\ferou* Flora qf Canada, with iti Geological Relations. 



II, Revision in detail of the Devonian and Silurian Mora. 



1. Devonian Plautg. 



2. Upper Silurian Plants. 



m. ^omparitone and Conclusions. 



1. Geographical Conditions, with reference to Pre-Oarboniferous Vege. 



tation. 



2. Compaiisons of the Devonian and OarbonifBrons Floras. 



3. Comparisons of the Devonian Flora of Chnada with that of Europe. 



4. Relations of the Devonian to older Floras. 

 6. Practical Utility of the Subject. 



6. Tabular View of the Distribution of Pre-Carboniforous Plants. 



I. HlSTORICAI, NOTICB OP THE PrE-CarBONIFEROUS FlORA OF CANADA, 

 WITH ITS GeOLOQICAL RELATIONS. 



My attention was first directed to the special study of the Devonian 

 Flora by the discovery on the part of Sir W. E. Logan, in 1843, of 

 numerous fossil plants in the sandstones of Gaspd Bay, named by him 

 the " Gasp^ Sandstones ; " but it was not till 1859 that I had oppor- 

 tunities to examine Sir William's collections, and to visit Gaspd with the 

 view of studying the plants in situ. In that year I communicated to the 

 Geological Society of London my paper on the " Fossil Plants of the 

 Devonian Rocks of Canada, " in which I described the remarkable root- 

 beds existing in the Gaspd Sandstones, and instituted the genera Pro- 

 totaxites and Pailophyton for the reception of two of the more novel 

 forms discovered. Since that time, I have extended my observations od 

 the Devoniau Flora to the rich plant-beds of St. John, New Brunswick, 

 and Perry, Maine ; and have enjoyed the opportunity of studying the 

 fossil plants discovered in the Devonian of New York by the Geological 

 Survey of that State, and kindly communicated to me by Prof. Hall. The 

 results, embodying notices or descriptions, of about eighty-two speciesy 



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