Te rae 
offered for sales ds Hisionincieal botanical correspondents, as we are 
remember ae all,).1 were. De, Bigelow, of Fieaies ; Mr. Nouall, Dr. 
Beck, of Albany ; Dr. Torrey and Mr. Eddy, of New York; Rev. 
H. Steinhauer, of Bethlehem; Mr. Schweinitz, Dr. Midikahes: 
Mr. Elliott, of Charleston; Dr. McBride, Mr. Le Conte, of Savan- 
nah; Dr. Boykin, of Milledgeville; Dr. Baldwin, and Mr, Rafinesque. 
If desired, a more minute description of the herbarium will be 
furnished by Mr. Charles Pickering, of Philadelphia, to whose ex- 
amination and judgment, this herbarium has been referred. - 
3. The coal beds of Pennsylvania equivalent to the great secon- 
-y coal measures of Europe. 
To Prof. Silliman.—At ca ninety first page of the second edi- 
tion of my Geological Text Book, (published last June,) I adduced 
facts, in proof of the correctness of the heading of this article. 
Since its publication, Mr. James Hall, adjunct professor in this in- 
stitution, has made probably, the most extensive collection of veget- 
able fossils in Pennsylvania, that bas hitherto been made on this con- 
tinent. It was the intention of Mr. Hall and myself to have deter- 
mined the names of all which had been described by M. Brongniart, 
and to have given lithographic figures of the remainder. But we 
are prevented by other engagements. 
At present, I will merely give a list of the names of those which 
_ we determined by the aid of M, Brongniart’s figures and descrip- . 
_ tions, as far as his sixth number. I have now before me twenty three 
_ ascertained species of ferns, from the coal mines of Pennsylvania, 
_ which Brongniart has described, as belonging to the great secondary 
coal fo: 
rmations of pai fend in the secondary class of rocks 
Hence th di the Alleghany and Cats- 
£2CLUCOC LUI avo D 
: kill Bivaiiaice: Sansiion. Tf organized remains are any evidence 
— of the equivalent characters of rocks, these mountains are surely se- 
ondary. ‘They are the upper secondary of some distinguished Eu- 
_ fopean geologists, the upper stratum of the lower secondary of oth- 
= ors while others seem unwilling to admit a division of the secondary 
_ It appears to me, that the ‘Alleghany and Catskill Mountains may 
| EM ananed, confidently, as the grand starting range for settling: all 
oe _ questions relating to the equivalent strata of the Eastern and Western 
 €0) tin ‘ 
I feel that I am fully supported in the position I have ta- 
