Miscellanies. ~ 397 
OTHER NOTICES. 
i. Exchanges of organized remains.—In a letter dated Heidel- 
berg, May 17, 1830, to the editor, written by Prof. C. H. Bronn, 
that gentleman enquires, whether there are persons in this country 
who are disposed to exchange fossil organized remains; he is inclined 
to obtain those of North ae ica from persons situated in different 
states where there are organized remains, to furnish those of Europe 
in exchange, and to add the names ‘which they sustain in Germany. 
“He mentions some of our most distinguished naturalists, with whose 
labors he appears to be well acquainted, and he wishes us to ex- 
cite an interest among those, who have the best opportunity and 
the strongest inducement, to collect specimens, principally from 
_the more ancient formations, which he regards as the most interest- 
ing; he is aware that they are extensively diffused in the states of 
Pennsylvania, New York, (he names Trenton Falls, Albany, Black 
River, Plattsburgh, Hudson city, Lakes Seneca, Erie, Ontario, &e.) 
Canada, (Falls of Montmorency, Ottowa River, York, Lake Hu- 
ron,) and in the Cattskill mountains. - 
He adds, “If my offers should be acceptable to any person, I will 
endeavor, in the course of half a year at most, to collect and prepare 
what may be most interesting to them, (as soon as I shall have been 
informed what may be. avheedtilé -) That we may be mutually in- 
formed what will be an equivalent, each should advise the other of 
the number of species of petrifactions which he can furnish, and to 
avoid unnecessary expense in transportation, that each particular 
parcel (envoi) should neither be too smal] nor burdened with speci- 
mens which are imperfect, or too heavy in proportion to their value.” 
It will afford. us much pleasure if, through the medium of this Jour- 
nal, we can call the attention of naturalists throughout the United 
States and Canada, to the interesting object proposed by Dr. Bronn. 
Such exchanges cannot fail to be highly useful, and it remains prin- 
cipally for our young and active collectors, not yet embarrassed by 
too much duty, to avail themselves of the present pans ate op- 
portunity. 
The field of organized remains in this country is vast, and much 
of it is of the geological age indicated by Dr. Bronn, that is what 
is usually’called the transition and older secondary, which cover so 
large a part of the states of New ee Pennsylvania, &e. ae is ogg 
Vou. XX.—No. 2. “4 
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