296 Prof. Gray's Address before the 
Differences of climate, or circumstances of migration, or both, 
must have determined the survival of Sequoia upon the Pacific, 
and of Zaxodiwm upon the Atlantic coast and still the redwoods 
will not stand in the east, nor could our Zaxodium find a con- 
redwoods ; the other is far south in the Andes of Chili. | 
enealogy of the Torreyas is more obscure ; yet it 18 a 
unlikely that the yew-like trees, named Juxrites, which flourish 
with the Sequoias in the tertiary arctic forests, are the remote 
ancestors of the three species of Torreya, now severally 1 
Florida, in California, and in Japan. 
s to the pines and firs, these were more numerously a880- 
ciated with the ancient Sequoias of the polar forests than with 
their present representatives, but in different species, “pp 
more like those of eastern than of western North America 
They must have encircled the polar zone then, as they encircle 
the present temperate zone now. 
I must refrain from all enumeration of the angiospermous OF 
ordinary deciduous trees and shrubs, which are now known by a 
their fossil remains to have flourished throughout the — = 
regions when Greenland better deserved its name, and i 
the present climate of New England and New Jersey. : 
Greenland and the rest of the north abounded with oaks, eee” 
senting the several groups of species which now inhabit both ou 
eastern and western forest districts; several poplars, one bev! 
like our balsam poplar or balm of gilead tree; more beec 
than there are now, a hornbeam, and a hop hornbeam, somé 
birches, a persimmon, and a planer-tree, near se ae re pe 
those of the Old World, at least of Asia, as well as of Atlant _ 
North America, but all wanting in California; one Juglans 
