006 



PRELIMINARY REMARKS 



ANALYSIS OF MATRIX OF SKULL OF OREODON. ANALYSIS OF MATRIX OF SCAPULA 



OF PALiEOTHERIUM. 



Water of absorption, .... 



TT 



a 





2-50 





4-00 



Flesh-coloured, siliceous earth, insoluble in HC1. 





= 



33-00 



Silica, . 



. 59-00 













1000 



Carbonic acid . 



■ \j 





1 q .nn 



X <J \3\J 





12-20 



Sescjuioxide of iron, .... 



Fe 





2-00 





7-20 



Alumina, ..... 



. Ai 





1-00 





. 4-20 



Manganese, ..... 



. Mn 





1-00 







Magnesia, ..... 



- Mg 





100 







Phosphoric acid, .... 







1-80 





. 1-90 



Chlorine, ..... 



. CI 





0-44 





. 0 037 



Potash, ..... 



. k 





4-08 



Sulphuric acid, 



. 003 



Loss and soda, .... 



. Na 





3-28 



Loss and alkalies, 



. 1-433 









100-00 





100 000 



ARTICLE V. 



SYSTEMATIC CATALOGUE OP PLANTS OF WISCONSIN AND MINNESOTA, BY C. C. PARRY, M.D., 

 MADE IN CONNEXION WITH THE GEOLOGICAL SURVEY OF THE NORTHWEST, DURING THE 

 SEASON OF 1848. 



The accompanying list of plants embodies the observations I have been able to make during the past 

 season, in connexion with the Geological Survey of the Northwest, under the direction of Dr. Owen. 



I have also incorporated some personal observations made during a previous season in the State of 

 Iowa; being properly comprised within the District of the Northwest; and enabling me to present a 

 more complete view of the botanical features of this region, than could otherwise be done during a single 

 season's operations. 



The precise region of country covered by these observations, will be sufficiently indicated by the sub- 

 joined localities. The time of collection, with other points of special interest, also accompany each sepa- 

 rate name, in the order in which they stand. 



The order followed is the Natural System ; and the authority used, " Torrey and Gray's North American 

 Flora," and "Gray's Botany of the Northern United States." 



Being desired by Dr. Owen's instructions to have special reference to the geological relations of the 

 plants observed, a few preliminary suggestions on this point will not be deemed out of place. 



It is evident on the slightest observation, that all the relations of accompanying vegetation to geology 

 are to be sought through the common medium of the soil: in so far only as any geological formation is 

 capable of giving a distinctive character to this medium, may we expect to find geological characters 

 equally marked on the vegetation. This fact has been particularly noticeable in the region of country 

 traversed during the past season. The passage from one geological formation to another — especially 

 when distinctly marked — is always accompanied with a change in the botanical features, perhaps propor- 

 tioned to the extent of exposure, but still more obviously connected with evident difference in the over- 

 lying soil, dependent on this geological change. 



Another example is found in the modifying influence of trap ranges upon the superincumbent vegeta- 

 tion, which influence is at times so marked, that even when not exposed, the direction and width of the 

 range can be traced with considerable certainty by their means alone. 



