1 882. 163 Trans. N. V. Ac. Scz\ 



within the last fifty years, to supply a forge in the former county. 

 These ores are the same with the brown hematites of the Great Valley 

 on which all the furnaces between New River and the State line 

 depend for supply. For the most part this ore is of excellent quality, 

 and Mr. McCreath's analysis shows 58 per cent, of metallic iron, with 

 only 75 thousandths of one per cent, of phosphorus, and less than 4 

 per cent, of insoluble matter. It is not improbable, however, that the 

 ore may average higher in phosphorus than the sample analyzed. 



Manganese occurs with these Lower Silurian ores, and sometimes it 

 is of excellent quality. At one locality ore was obtained which has 

 81.45 per cent, of oxide of manganese, with but 27 thousandths of one 

 per cent, of phosphorus. 



The Tennessee marbles, belonging to the Trenton Group, must not 

 be overlooked. These occur in the area lying behind Clinch Mountain, 

 where the quantity is almost inconceivable. A number of samples 

 from EstillviUe, in Scott County near the State line, were polished, and 

 eight of them were regarded by dealers as belonging to the first grade. 



The following paper was read by title : 

 " Index to the Literature of Electrolysis and its appli- 

 cations, 1784-80;" by W. Walter Webb, assistant in the Scien- 

 tific department of Trinity College, Hartford, Conn. This paper 

 will appear in the Annals, forming another member of the series of 

 Indexes to the Literature of Chemistry, therein contained. 



May I, 1882. 

 Regular Business Meeting. 

 The President, Dr. J. S. Newberry, in the Chair. 



The report of the Council was read, recommending the election 

 to Resident Membership of 



Rev. Edward Payson Thwing, 

 Rev. B. F. Da Costa. 

 Their election was voted unanimously. 

 Mr. W. LeConte Stevens exhibited and described 



AN IMPROVED FORM OF ORGAN-PIPE SONOMETER.* 



Dr. B. N. Martin read an extended notice of the life and works 

 of the late Prof. John W. Draper.! 



* Published and illustrated in the American Journal of Science, 1882. 

 t Published in full in the Magazine of American History, 1882. 



