508 Miscellaneous Intelligence. 
rege of these, again, is subdivisible into three, as follows :— 
The Atlantic slope plus Mississippi region, enbdivisible into 
a an Atlantic (8) a Mississippi valley, and (y) an interposed 
mountain region with a temperate and sub-alpine flor 
(2.). The Pacific ies subdivisible into (a) a very dual cool] 
forest-clad coast range; (/) the great hot drier Californian val- 
ley formed by the San J oaquin River flowing to the north, and the 
Sacramento River flowing to the south, both into the Bay of San 
— and (y) the Sierra Nevada flora, temperate, sub- alpine; 
and alpin 
(3.) The Rocky Mountain region (in its widest sense extending 
from the Mississippi beyond its forest ie? to the Sierra Ne- 
vada), subdivisible into (a) a prairie flora; (/) a desert or saline 
flora; (v) a Rocky Mountain proper flora, temperate, sub-alpine, 
and alpine. 
As above stated, the difference between the floras of the first 
and second of these regions, is ne snares and to a great extent 
generically absolute ; not a pine or oak, maple, elm, plane, or birch 
of Eastern America extends to piety and genera of thirty to 
fifty species are confined to each. The Rocky Mountain region, 
again, though abundantly distinct from oR: re a few elements 
of the eastern region and still more of the w 
the on temperate an and rigid zones, and which had a ready en- 
gaged Dr. Gray’s attention, as may be found in his various publi- 
cations. No less interesting are the traces of the influence of a 
continent, and of the effects of the great body of water that oc- 
a the whole saline region during (as it would oe a gla- 
cial period. 
eocnee was ma Pi A ray’s. 
ously visited both the Rocky Mountains and California, shows 
not with the same object. But for unflinching determination 
More reover, chantighins the ex saci on we seule great hos- 
pitality, aud enjoyed unusual facilities, not only from the staff of 
