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ands. It is subdivided into three districts; viz., the eastern forest country the eastern prairies, and the country west of the crest of the Rocky Mountains.

The second zone comprehends all the country lying between the arctic circle and the extremities of the continent in latitude 72°. It was not found practicable, owing to the way in which the herbaria were formed, to separate the barren ground species from those growing in the woody country, and the zone has been made to include three districts, one of which is Kotzebue Sound, where 273 species have been collected by Chamisso and others.*

The Rocky Mountain ridge, between the 52d and 57th parallels, has been made a second district of this zone, as many arctic species go southward along the elevated crest of the ridge. I have not been able, however, to separate the species collected by Drummond in the lower valleys of the ridge from those gathered high up on the peaks. From the untiring diligence and unrivaled quickness of eye of this celebrated collector, we may consider the district as well explored; and had the vertical ranges of the species 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 73d 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 Melville 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 en circles the earth.

* Mr. Seeman, who was employed as botanist, in the Herald's late voyages to that quarter, has made a much more ample herbarium of the northwest coast; but as he has just arrived in England as these pages are passing through the press, I can avail myself only partially of his researches for the improvement of the table.

NUMBERS OF SPECIES IN DIFFERENT ZONES.

445

STATISTICAL ENUMERATION OF THE NUMBERS OF SPECIES BY
FAMILIES AND GENERA IN DIFFERENT ZONES.

[For the plants marked * see corrections on p. 462.]

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