ADVERTISEMENT TO THE THIRD EDITION. 



In the nine years which have elapsed since the appearance of the 

 second edition of this work, much has been added to our knowledge 

 of the Geology of the Maritime Provinces of the Dominion of Canada ; 

 and thus the book has been, in some respects, falling behind the 

 requirements of the time. In these circumstances, instead of revising 

 the whole, I have thought it best to add to it a Supplement containing 

 such additions and corrections as have been required by the lapse of 

 time. In this way the work will be brought up to the state of know- 

 ledge in 1878 ; while, as the Supplement will be issued separately, 

 those who possess the second edition will be able to procure the now 

 matter alone. 



Though the work is one of local Geology, yet the region to which 

 it relates has afforded so many facts of general interest, and the topics 

 discussed are so wide in their bearing, that it is hoped that this new 

 issue will be found useful and interesting to Geologists generally. 



J. W. Dawson. 



Bi'QlLL College, January 1878. 



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