VI CONTENTS. 



NUMBER II. 



Art. I. Geology of the Country between Baltimore and the Ohio 



River, with a section ; by Prof. William E. A. Ai- 



Page. 



KIN, 



219 



II, On Porcelain and Earthenware, - 233 



III. Researches respecting the radical of Benzoic Acid; by 



Wohler and Liebig, - - - - 



IV. Supplement to a letter to the Hon. W. J. Duane, on se- 



curities against fire, &c. f - 

 V. On the Parallelogram of Forces ; by Prof. Theodore 



261 



286 



Strong, 



304 



VI. Prof. John 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. Twining, Civil 

 Engineer and late Tutor in Yale College, - - 320 

 IX. Communications by Dr. Hare, - - 352 



X. Analysis of Shells; by Prof. William B. Rogers, 361 



XI. Description of some new Shells, belonging to the coast 



of New England ; by Col. Jos. G. Totten, - 366 



XIL Dr. T. Edmondson's Modification of Ampere's Rotating 



Galvanic Element, 



XIII. A Method of obtaining Iridium and Osmium from the 



Platinum residue; by F. WGhler. Translated by J. 



3?a 



C. Booth, 



371 



XIV. Cartography; by Prof. C.Dewey, - 376 



XV. Communications by Dr. John Locke, 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 — Wdrthite — Pyrargillite — Amphodel- 



lite, 



387 



10. Ozokerite, a new combustible mineral, ... 388 



11, 12. Platinum in France — Carrageen or Irish 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 



