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CONTENTS. - 
—— 
Notes of a Botanical Excursion to the Mountains of 
North Carolina, &c.; with some remarks on the Bot- 
any of the ae ie Mountains ; by Asa Sie ' 
IL. pe of fats opieialiiadl Pikes of Canta Ohio ; 
Til. 
IV. 
V. A 
by Wm. 8S. Suxiivanr, 
N — sot et the — of the Wenesin States ; ; by laues f 
os ea ‘Perchlovits of ne Oxide of Ethule, or Perchloric 
Ether ; by Crarx Hare and Martin H. Boye, - 
new Demonstration of the Principle of Virtual Veloci- 
ties; by Prof. THroporE Strong, - 
. Solution of a Functional Equation, which has Seine em- 
ployed by Poisson in demonstrating the ea 
of forces; by Georce R. Perxins, A.M., - 
Bxpasinishie on Bichlorure of Sulphur and certain car- 
bures of hydrogen ; by Prof. F. Cuever, - - 
Continuation of the Remarks made upon vormengine con- 
sidered in a ttn pene! view ; “ J. La 
2 _RENCE Surrx, M. D., 
upon an examination of the Peroxide of Man- 
iho a 
ganese ; by Henry C. Lea, - ts i 
A'Sketch of the Infusoria of the family Bacillaria, ieee 
some account of the most interesting hich 
have been found in a recent or fossil state in the United 
States ; with two plates, by Prof. J. W. Barney, . 
Description of Eight new Species of Shells, native to 
the United States; with a plate, by Henry C. Lea, - 
Observations on the Storm of December 15, 1839; by 
Wittiam C. Repriexp, A. M., 
Temperature of the cities of iin, (Italy) and itew 
York; by Jeremian VAN Renssexaer, M. D., 
Observations and Experiments on mee iy Prof. Site. 
vet Apams, M.D., - 
The Birds of America, from aiicsriae dia in ‘is Uni- 
ted States and their Territories ; by Joun James Aupvu- 
Bon, F. R.S., : 
Notice of Fos Bones rom Oregon Tentory sb by H.C. 
PERKINS, - 
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Page. 
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