526 APPENDIX. 



Thalyctrum corynellum, De Candolle. St. Louis River. 



Triticum repens^ Linn^us. Leech Lake. 



Troximon virginicum^ Pursh. Lake Winnipec. 



Talinum teretifolium^ Pursh. St. Croix River. 



Tradescantia virginica. Upper Mississippi. 



Utricularia comuta, Michaux. Lake Superior. 



" purpurea^ AValter. Lac Chetac, N. "W. Ter. 



Uraspermum canadense^ Lake Superior to the Miss. 



Viola lanceolata^ Linnseus. Sault Ste. Marie. 

 " pedata, Var. (or N. Spec). Lac la Biche, sources of the Miss. 



Viburnum oxycoccus^ Pursh. Lake Superior. 

 " lentago. Lake Superior. 



Vernonia Tiovoboracensis, Willdenow. Upper Miss. 



Verbena bracteosa, Michaux. Upper Miss. 

 " stricta, Yentenat. Upper Miss. 



Zapania nodiflora, Michaux. Galena, Illinois. 



Zigadeyius chloranthus^ Richardson. Sandy shores of Lake Michi- 

 gan. 



Zizania aquatica, Pursh. Illinois to the sources of the Miss. 



VII. 



MINEEALOGY AND GEOLOGY. 



1 . A Report on the Existence of Deposits of Copper in the Geological 

 Basin of Lake Superior. By Dr. D. Houghton. 



Fredonia, N. Y., November 14, 1831. 



Sir : In fulfilment of the duties assigned to me in the late ex- 

 pedition into the Indian country, under the direction of H. R. 

 Schoolcraft, Esq., Indian Agent, I would beg leave to transmit 

 to you the following observations relative to the existence of 

 copper in the country bordering on the southern shore of Lake 

 Superior. 



It is without doubt true that this subject has long been viewed 

 with an interest far beyond its actual merit. Each mass of native 

 copper which this country has produced, however insulated, or 

 however it may have been separated from its original position, 

 appears to have been considered a sure indication of the existence 



