X PREFACE. 



and encourage others, who may now carry on the work more effectually 

 in connexion with an organized Geological Survey. 



The numerous additional Illustrations in this Edition have been 

 engraved by Mr J. H, Walker of Montreal, principally from my own 

 drawings or from photographs. The post-pliocene fossils are from 

 figures in the Canadian Naturalist; the Carboniferous Brachiopods 

 have been copied from Mr Davidson's figures ; the Devonian Insects 

 are from drawings by Mr Scudder ; and the Primordial Fossils have 

 been drawn by Mr Smith of the Geological Survey of Canada. By 

 reference to the Classified List of Illustrations, it will be seen that 

 more than two hundred and fifty species of fossils have been figured ; 

 and I have added a note referring to the Memoirs which contain illus- 

 trations of those new species of fossils noticed but not figured in this 

 Work. 



In the Explanation of the Geological Map will be found references 

 to the authorities consulted in its preparation. 



M'GiLL College, Montreal^ 1868. 



