CONTENTS. 



Laws of the Society relating to the Transactions, ----- iii 



Officers of the Society for the Year 1841. ...... y 



List of the Members of the Society elected since the Publication of the Sixth Volume. - vi 



Obituary Notice. --------.. viii 



ARTICLE L 



Observations to determine the Magnetic Dip at various places in Ohio and Michigan. By 

 Elias Loomis, Professor of Mathematics and Natural Philosophy in Western Reserve 

 College. In a letter to Sears C. Walker, Esq., M. A. P. S. - 



ARTICLE II. 



1. Letter from the Rev. Charles GutzlafF to John Vaughan, Esq., on the Chinese System 

 of Writing. 2. Letter from Mr. Duponceau to the same, ordered by the Society to be 

 published with the preceding one, to which it is an answer. .... 



ARTICLE III. 



On the Extrication of the Alkalifiable Metals, Barium, Strontium, and Calcium. By Robert 



Hare, M. D., Professor of Chemistry in the University of Pennsylvania. - - 31 



ARTICLE IV. 



Astronomical Observations made at Hudson Observatory, Latitude 41° 14' 37" North, and 

 Longitude 5h. 25m. 42s. West; with some Account of the Building and Instruments. 

 By Elias Loomis, Professor of Mathematics and Natural Philosophy in Western Reserve 

 College, Hudson, Ohio. ..--...-43 



VII. — C 



