314 THE CANADIAN NATURALIST. [Sept. 



ubilo its less aspiring brother {P. Drijopterls) had chosen a more 

 congenial spot in the hollow at the base. The delicate Bladder 

 Fern (Ci/stoj^teris fmgilis) peeped out from crevices in the rock, 

 while two Shield-Ferns (^Asjyidwm sp'uudosum and J., marglnale) 

 and the Lady-Fern {Asplenlum FlUx-fmmlna) clothed the borders 

 of a little brook. In the dry fields the Plantain-leaved Everlasting 

 {Antennaria plantaglnifoUci) was everywhere abundant. 



Throughout the Laurentian country the soil upon limestone 

 bands is in general much richer than that upon other kinds of 

 rock, and its influence upon the vegetation is very marked. The 

 X^ines and other evergreens which generally accompany gneissose 

 rocks, give place to hard-wood trees ; the shrubs, and other plants, 

 too, are those which are usually found in rich, moist woods. The 

 following list of plants, collected on the 12th of June, while 

 following the Bridgewater limestone southwards, makes this 

 evident : — 



Acer rubrum, Tiarella cordifolia. 



saccharin am, Trillium erectum, 



spicatum, Trieutalis Americana, 



Aquilegia Canadeusi^<, Dentaria diphylla, 



Sanguinaria Canadensi.s, Ampelopsis quinquefolia, 



Osmorrhiza hrevistylis, Yiola Canadensis, 



Actpea spicata, A^iburnum lantanoides, 



TTvnlavia grandiflora, Polygonatum biflorum, 



Smilacina bifolia, Streptopus roseus, 



racemosa, Adiantum pedatum, 



Dicentra Canadensis, Aspidium acrosticboides, 



Caulopbyllum thalictroides, Polypodium Pbegopteris, and 



Aralia trifolia, Botrychium Yirginiauum. 

 Mitella dipbylla, 



On the 13th June, we followed the limestone in the opposite 



direction from the day before, and found other circumstances 



coming in to alter the character of the vegetation. The limestone 



occupied a depression, bordered on either side by high ridges of 



gneiss, and the water accumulating in this hollow had formed a 



Cedar and Black Ash {Fraxinus samhudfolid) swamp, which 



would be well nigh impenetrable to any but an enthusiastic 



naturalist. On the borders of this swamp we found Aspidium 



Thehjpteris and A. cristatum, and just within its dismal confines 



gathered Asplenium thelypteroides. A little further and the 



Clintonia (C horealis) spread its broad leaves over the 



moss, and seemed to tinkle its bell-like flowers, and the delicate 



Twin-flower (^Linncea horealis) covered the stumps as if to con- 



