1882. 163 Trans. N. Y. Ac. Sct. 
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 Estillville, 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 1, 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 THwWING, 
Rev. B. F. Da Costa. 
Their election was voted unanimously. 
Mr. W. LEConrE 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. Joun W. DRaAPER.T 
* Published and illustrated in the American Journal of Science, 1882. 
+ Published in full in the ‘Magazine of American History, 1882. 
