6 Canadian Record of Science. 
Hudsonia ericoides, L. Gnaphalium sylvaticum, L. 
Potentilla nemoralis, Nest. Gaylussacia dumosa, T. & G. 
Rosa nitida, Willd. Calluna vulgaris, Salisb. 
Lythrum salicaria, L. Kalmia latifolia, L., if localities 
Aster radula. Ait. confirmed. 
A. Novi-Belgii, L. Rhodora Canadensis, L. 
A. tardiflorus, L. Betula alba var. populifolia,Spach. 
Dipplopappus linariifolius, Hook. CoremaConradii, Torr. 
Solidago speciosa, Nutt. Solidago puberula, Nutt. 
Some of the special influences which limit the range of 
the species of this group, are not difficult to conjecture. The 
Appalachian chain of mountains has no doubt acted as a 
barrier to the westward progress of many plants, as it has 
to the eastern extension of many others. The more equable 
temperature, the moister atmosphere and the prevailing 
fogs, so pronounced on the immediate coast, especially of 
Nova Scotia, New Brunswick, Newfoundland and the St. 
Lawrence estuary, must exercise some influence inland as 
well, thougb this influence necessarily diminishes as tbe 
distance from the coast increases. A marked illustration of 
this influence will be referred to in the case of the British 
Columbia plants. 
The most remarkable feature, however, in the eastern 
coast distribution, is the absence of such a large number of 
the familiar trees, shrubs and herbaceous plants of the 
Upper St. Lawrence valley. It is quite probable that the 
same local causes which favour the distribution of the © 
species of this eastern coast group, may be prejudicial to 
the extension towards the coast, of many of these more 
inland plants now absent. Causes which affect even human 
life differently in different individuals, may equally well, 
even in a greater degree, we can readily suppose, have 
different effects on the plants of different species. It has 
always appeared to me probable that the dense fogs of the 
Nova Scotia coast may have something to do with the 
absence of such a northern and widely ranging tree as the 
white cedar, Thuja occidentalis, L.; and a similar cause, 
and the moister atmosphere generally, may have also some 
influence in limiting the range in both New Brunswick and 
