THE ORIGIN OF THE FLORA OF ATLANTIC NORTH AMERICA. 311 
* Now, the only known cause of such likeness is inheritance, and as all 
transmissions of likeness is with some difference in individuals, an 
changed conditions have resulted, as is well known, in very considerable 
differences, it seems to me that, if the high antiquity of our actual vege- 
tation could be rendered probable, not to say certain, and the former 
habitation of any of our species, or of very near relatives of them, iu 
0 
high northern regions could be ascertained, my whole case would be made 
the period, the region which geographically connects the two 
(once doubtless much more closely than now) but survives only in the 
Atlantic United States and Mexico. 
€ 
age. Another Sequoia (8. Sternberyii), discovered in the miocene deposits 
in Greenland, is pronounced to be the representative of S. gigantea, the 
big tree of the California Sierra. If the Taxodium of tertiary time in 
of our present 
ifically identical, 
two 
: t we may, with our present light, 2 
Redwoods of California are the probable descendants of the two ancien 
x which so closely resemble the 
other Species of Sequoia, as determined by their remains, one 
uch 
Another, ‘ which appears to have b 
tee on Disco,’ was common in England and some 
ancestors and kindred formed a large part o à 
throughout the polar regions, now desolate and ice-clad, and which T 
tended into low latitudes in Europe. On this continent one species, a 
