Art. I. 
XIL. 
XII. 
XIV. 
XV. 
XVI. 
CONTENTS OF VOLUME XXIf. 
NUMBER I. 
Page. 
Prof. Hrrcncocx’s Report to the Government of Massa- 
chusetts on the Geology of that State, ° - 
. On the Hessian Fly; by Dr. Josern E. Muse, - 
Mathematical Papers; by E1izur Wricur, Esq. - 
. Description of the American Wild Swan, proving it to 
be a new species—Cygnus Americanus; by Joun T. 
Suareress, M. D. - = - u = 2 
. On the analogy which exists between the Marl of New 
Jersey, &c. and the Chalk formation of Europe; by S. 
G. Morrow, M. D., - - - = 3 a 
. Description of an instrument called the Steam Pyrome- 
ter; by Prof. Watrer R. Jounson, - > - 
On pure Chloric Ether; by Samven Gurnriz, - - 
. Steam Boats protected from the Effects of Lightning; by 
ALEXANDER Jones, M. D., - - - - - 
. Abstract of Meteorological Observations for 1831, taken 
at Marietta, Ohio; by Dr. 8. P. Hizwpreru, - - 
. Further Experiments on the Disinfecting Powers of In- 
creased Temperatures; by Witiiam Henry, M. D. 
F.R.S., &c. - = - = = = 2 
. Remarks upon the Natural Resources of the Western 
Country, - - - - - - - - 
On the Artificial Preparation of cold Medicinal Waters ; 
by Wittiam Meant, M.D., - - - - - 
On Central Forces; by Prof. THeonore Strona, - 
Experiments on the Expansion and Contraction of Build- 
ing Stones, by variations of temperature ; communica- 
ted by W. H.C. Bartuerr, - - - - - 
On two new acid compounds of Chlorine, Carbon, and 
Hydrogen; by Avcustus A. Hayes, - - - 
On a disturbance of the Earth’s magnetism, in connexion 
with the appearance of an Aurora Borealis, as observed 
at Albany, April 19, 1831; by Josep Henry, - 
83 
14] 
143 
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