Geology and Natural History. 207 
The * Origin of Crystalline Rocks,” the subject of the second 
d. Facts are to 
part of the address, is next discussed. brought 
not b oO 
review of recent observations, and mainly his own, connected with 
the origin of the minerals constituting and associated with the 
Specimens of Eozoon; and finally treats briefly of the origin of 
estones and dolomites, making some great formations of them 
of chemical origin. 
€ conclusions throughout Dr. Hunt’s address are open to 
doubts and objections; but their discussion would require as many 
pages as he has found necessary for presenting them. 
2. The distribution of Maritime Plants in North America a 
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Properly belong to sea-shores, and draws from them the conclu- 
‘lon expressed in the title of his paper above given. The argu- 
went is an important one. But still it may be queried, consider- 
ing the much greater number of shells and of other kinds of 
marine animal life that must have existed in those Champlain 
“eas, whether their absence from the same regions all over the Uni- 
ted States, beyond a height of 300 to 600 feet above tide-level in 
““ More northeastern portions, is not better proof that the sea 
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al —with the exceptions along the borders of the Atlantic, along 
€ River (then Gulf of) St. Lawrence, and on Lake Champlain 
oe an arm of that Gulf )—without any traces of marine animal 
shore 
oe of the continent, in the supposed case, would be b 
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__* Waters of a great interior sea, having only the very feeble 
