vi CONTENTS. 
NUMBER II. 
Page. 
Art. I. Geology of the Country between Baltimore and the Ohio 
River, with a section; by Prof. Witxiam E. A. At- 
KIN, - - - - - - - - 219 
II. On Porcelain and Earthenware, - - - - 233 
III. Researches respecting the radical of Benzoic Acid; by | 
Wouter and Liezsie, - - - - - 261 
IV. Supplement to a letter to the Hon. W. J. Duane, on se- 
curities against fire, &c., - - - - - 286 
V. On the Parallelogram of Forces; by Prof. THroporE 
STRONG, - - - - - - - - 304 
VI. Prof. Joun P. Emmet, on Thermo-Electricity and Elec- 
tro-Magnetism, - - - - - - 311 
VII. Botanical Communications; by H. B. Croom, Esq., 313 
VIII. Investigations respecting the Meteors of Nov. 13th, 
1833.—Remarks upon Prof. Olmsted’s theory res- 
pecting the cause; by ALEXANDER C. Twinine, Civil 
Engineer and late Tutor in Yale eee - - 320 
IX. Communications by Dr. Harz, - - - 3902 
X. Analysis of Shells; by Prof. Witt1am B. RoeeErs, 361 
XI. Description of some new Shells, belonging to the coast 
of New England; by Col. Jos. G. Toren, - 366 
XII. Dr. T. Epmonpson’s Modification of Ampére’s Rotating 
Galvanic Element, - - - - - - 370 
XIII. A Method of obtaining Iridium and Osmium from the 
Platinum residue; by F. Wouter. Translated by J. 
C. Boor, - - - - - - - 371 
XIV. Caricography; by Prof. C. Dewey, - - - 376 
XV. Communications by Dr. Joun Locxg, of Cincinnati, 378 
MISCELLANIES.—FOREIGN AND DOMESTC. 
1, 2, 3, 4, 5. A new ore of Antimony—A new Tenantite—Vana- 
diate of lead—Plumbacalcite—Pelokonite, - = 386 
6, 7, 8, 9. Wolchouskoit—W orthite—Pyrargillite-—Amphodel- 
lite, = > - 2 ; - - - - 387 
10. Ozokerite, a new combustible mineral, - - - 388 
11, 12. Platinum in France—Carrageen or Trish Moss, - 389 
13, 14. Oil of Copaiva as a test for the purity of the sulphuric 
ether—Discharge of the stain of indelible ink, by corro- 
sive sublimate, - - - - - - 392 
15. Dissection of the eye of the Halibut, - . - - 393 
