CONTENTS. 



ARTICLE V. 



Description of an Apparatus for Deflagrating Carburets, Phosphurets, or Cyanides, in Vacuo 

 or in an Atmosphere of Hydrogen, with an account of some Results obtained by these 

 and by other means; especially the Isolation of Calcium. By Robert Hare, M. D. - 53 



ARTICLE VI. 



Upon a new Compound of the Deuto-Chloride of Platinum, Nitric Oxide, and Chloro- 

 hydric Acid. By Henry D. Rogers, Professor of Geology in the University of Penn- 

 sylvania, and Martin H. Boye, Graduate of the University of Copenhagen. - - 59 



ARTICLE VII. 



On the Longitude of Several Places in the United States, as deduced from the Observations 

 of the Solar Eclipse of September 18th, 1838. By E. Otis Kendall, Professor of Mathe- 

 matics in the Central High School of Philadelphia. - - - - - 67 



ARTICLE VIII. 

 On the Patella Amaena of Say. By Isaac Lea. ------ 73 



ARTICLE IX. 



Observations of the Magnetic Intensity at twenty-one Stations in Europe. By A. D. Bache, 

 LL. D., President of the Girard College for Orphans, one of the Secretaries of the Ame- 

 rican Philosophical Society, &;c., &c. -------75 



ARTICLE X. 



Additional Observations of the Magnetic Dip in the United States. By Elias Loomis, Pro- 

 fessor of Mathematics and Natural Philosophy in Western Reserve College. - - 101 



ARTICLE XI. 



On a new Principle in regard to the Power of Fluids in Motion to produce Rupture of the 

 Vessels which contain them ; and on the Distinction between accumulative and instanta- 



