120 Catalogue of Plants collected in the 



lished primordial types, offers us the alternative of regarding 

 these strata as of the second stage, with the reappearance of pri- 

 mordial types in that era, or of bringing into the primordial zone 

 several genera heretofore regarded as beginning their existence 

 in the second stage: in either case, so far as now appears, con- 

 flcting with the scheme of Mr. Barrande in reference to the suc- 

 cessive faunae of trilobites as established in Bohemia and the rest 

 of Europe. 



For myself I can say, that no previously expressed opinion, 

 nor any " artificial combinations of stratigraphy previously 

 adopted'''' by me, shall prevent me from meeting the question 

 fairly and frankly. I have not sought a controversy on this 

 point, but it is quite time that we should all agree that there is 

 something of high interest and importance to be determined in 

 regard to the limitation of the successive faunae of our older pal- 

 aeozoic rocks. 



I am, yours, &e., 



James Hall. 

 Albany, N.Y., Jan. 23, 1861. 



ARTICLE VIII. — Catalogue of Plants collected in the Counties 

 of Argenteuil and Ottawa, in 1858. By W. S. M. D'Urban. 



The following list of Plants contains 362 species, all of which 

 were collected strictly within the Laurentian district, many intro- 

 duced species growing on the fossiliferous rocks in the immediate 

 neighbourhood of the town of Grenville, being omitted. A large 

 portion were determined by myself on the spot with the aid of 

 Dr. Asa Gray's admirable '* Manual of the Botany of the North- 

 ern United States," which was my almost constant compa- 

 nion during the five months I spent in the district, but I have to 

 acknowledge my obligations to Mr. G. Barnston, who kindly 

 assisted me in naming some phenogamous species ; to Col. Munro, 

 C. B., 39th Begt., who most obligingly determined the whole of the 

 sedges and grasses ; to Mr. D.Allan Poe, who examined the cryp- 

 togams, and named all the mosses, some of which ho submitted to the 

 eminent bryologist, Mr. James of Philadelphia ; and lastly to Dr. 

 Dawson for allowing me unlimited access for purposes of reference 

 to the Holmes herbarium deposited in McGill College. 



Many of the specimens collected were so small and depauperated 

 in form, from the poverty and scantiness of the soil that I found it 



