SECOND AND THIRD ZONES. 321 



been noted, there would be nothing more required for the 

 present investigation. 



The third district of the zone comprises the entire arctic 

 country, from Barrow's Point to Davis' Straits. 



The third zone lies to the north of the 73rd parallel, and 

 extends from Melville Island to Spitzbergen, including a 

 few species gathered above that parallel in Baffin's Bay, 

 and some collected by Dr. Scoresby on the east coast of 

 Greenland. No American land to the westward of Mel- 

 ville Island in so high a latitude has been discovered ; and 

 I have met with no flora of the polar Asiatic islands ; but 

 it is probable that, so far north, a nearly uniform vegetation 

 encircles the earth. 



VOL. II. 



