1864.] 



GRANT ON THE GEOLOGY OF THE OTTAWA. 



419 



Coclilearia tridactylites. 

 Thlaspi montanum. 

 Viola palustris. 

 Parnassia parviflora. 

 Dryas integrifolia. 

 D. octopetala. 

 Sibbaldia procumbens. 

 Rubus arcticus. 

 Epilobium alpiniim, 

 var. majus. 



Senecio pseudo-arnica. 

 Erigeron acre. 

 Arctostaphylos alpina. 

 Andromeda tetragona. 

 Pleurogyne rotata. 

 Rumex doraesticus. 

 Betula nana. 

 Salix reticulata, 



var. vestita. 

 S. repens. 



S. Groenlandica. 



2. Sub-Alpine species. 



Alsine Groenlandica. 

 Hedysarum boreale. 

 Astragalus secundus. 

 Dryas Drummondii. 

 Rubus Charagemorus. 

 Solidago thyrsoiJea. 

 S. virga-aurea. 

 Arnica mollis. 

 Vaccinum uliginosum. 

 V. Vitis-Idsea. 

 V. caespitosum. 



Castilleia septentrionalis. 

 Euphrasia oflScinalis. 

 Polygonum viviparum. 

 Empetrura nigrum. 

 Tofieldia palustris. 

 Scirpus cfespitosus. 

 Poa alpina. 

 Phleum alpinum. 

 Woodsia alpina. 

 Asplenium viride. 

 Lycopodium S elago. 



Of the alpine species enumerated, only eight are natives of the 

 United States ; but in the sub-alpine list there are only six, — Astra- 

 galus secundus, Dryas Druminondil, Tofieldia palustris, Poa 

 alpina, Woodsia alpina, and Asj)lenimn viride, which are not 

 likewise indigenous to the Northern States. Tofieldia palustris 

 is omitted from Dr. Gray's Manual, apparently under the mistaken 

 impression that Isle Royale on which it has been observed 

 does not form a part of the Union. The island belongs to 

 Minnesota, and does therefore strictly come within the limits of 

 the work. 



London, C. W., Oct., 1864. 



THE GEOLOGY OF THE OTTAT\^A VALLEY. 



By Jas. a. Grant, M.D., F.R.C.S.E., F.G.S. 



The channel of the river Ottawa, in this immediate neighbor- 

 hood, is wholly excavated in the Trenton limestone, which, to a 

 considerable extent, can be seen on both sides ; it also constitutes 

 the projecting points of rock seen from the Suspension Bridge, as 



