﻿216 Nichols: The vegetation of Connecticut 



to Pleistocene times,"* since from a physiographic standpoint it is 

 doubtful if such an assumption is tenable.t In the opinion of the 

 writer the bog habitats at present in existence may be of much 

 more recent origin. 



As has been mentioned elsewhere,| there is abundant evidence 

 tending to show that this invasion of areas populated by northern 

 bog plants is still going on. At several localities in the state are 

 bogs in which black spruce and coast white cedar occur together, 

 and in every instance the cedar seems unmistakably to be gaining 

 the ascendancy. In Southington is a large, boggy swamp now 

 overgrown with red maple and elm. Scattered about in parts of 

 the swamp, however, are numerous specimens of black spruce, 

 most of which are either dead or dying. Similar relations may be 

 observed elsewhere, and it is of importance to note that wherever 



