Botany and Loology. 395: 
predecessor, Der Vegetation der Erde nach ihver klimatischen 
Anordnung, of the late Prof. Grisebach, is conceived in a differ- 
0 d i more modern spirit 
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which he reached the conclusion—which the scientific world h 
then Just come to—that the present character and distribution of 
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a8 respects the northern hemisphere and its floras, where the key 
to the mystery was to be sought, Heer and Unger were reviving 
im this interest Plato’s idea of the Atlantis. But the very next 
year, 1856, the first memoir of the present writer was published 
(Mem. Amer, Acad., vol. vi), and what Nathorst and Saporta unite. 
iM pronouncing “ the true solution of the problem,” was brought 
to ight.* 
m these lines and from the doctrine of natural selection 
volume to the elucidation of the distribution of the vegetation of 
ame temperate part of the northern hemisphere. This part opens 
With a 7 N . 
ean torest during the Miocene, and its gradual transformation 
es * Ann. Sci. Nat., ser. 6, xv. 153.—Count Sarporta adds in a foot-note that 
Asa Gray was not the only botanist who had the idea of explaining the presence 
5 . * - ore: } 
Whence these vegetable races had radiated in one or several : 
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the remarkable works of Prof. 0. Heer,” ete. : 
The paralle}] memoirs there referred to are one by Count Saporta, published in 
i Marion. The 
first of these appeared in the same year with “Sequoia and its History 
iri i i Advance- 
ent of Science,” August, 1822: but the initial memoir, in . Amer. Acad., 
the publication of Heer’s researches upon the arctic Miocene 
ad r disadvantage—of developing the principal ideas 
from a consideration of the exi ing vegetation only,—not so well, im as has 
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dopted, it 
haps worth while to reproduce these dates. The explanation (given in 1878) 
‘Or the extinction of Tertiary elements of the flora in Europe, which have be: 
in America and Asia, is recapitulated by Nathorst, as likewise 
by Wallace, in his Island Life (pp. 119 and 120), in the latter case without 
allusion to its source 
